Ultimate Cheesy Ground Beef and Green Pepper Casserole
Introduction
This Ultimate Cheesy Ground Beef and Green Pepper Casserole is a comforting, flavorful dinner inspired by classic stuffed peppers.
Instead of stuffing individual peppers, everything is cooked together in one convenient casserole dish with seasoned ground beef, tender green bell peppers, tomatoes, herbs, and plenty of melted mozzarella.
The result is a hearty, cheesy meal that is easy enough for a busy weeknight and satisfying enough for a family dinner.
Recipe Overview
| Category | Details |
| Prep Time | 15 minutes |
| Cook Time | 30–35 minutes |
| Total Time | 45–50 minutes |
| Servings | 6–8 |
| Difficulty | Easy |
| Cuisine | American-inspired |
| Main Ingredient | Ground beef |
| Cooking Method | Stovetop and oven |
Why You’ll Love This Recipe
This casserole gives you all the comforting flavors of classic stuffed peppers without the extra work of stuffing and arranging individual peppers.
The combination of seasoned ground beef, sweet-tasting green peppers, onions, garlic, and tomatoes creates a deeply savory filling.
A generous layer of mozzarella melts over the top, creating a bubbly, golden finish with plenty of cheesy flavor.
It is also an affordable family dinner made with simple ingredients. That makes it a practical choice for budget-friendly meals, easy dinner recipes, and weekly meal planning.
For anyone looking for a satisfying homemade alternative to takeout, this casserole is an excellent addition to a regular dinner rotation.
Ingredients
Beef and Vegetable Mixture
| Ingredient | Quantity | Preparation |
| Lean ground beef | 1½ lb (680 g) | 90% lean recommended |
| Green bell peppers | 3 large | Seeded and diced |
| Yellow onion | 1 medium | Finely chopped |
| Garlic | 4 cloves | Minced |
| Olive oil | 1 tablespoon | For sautéing |
Tomato Sauce and Seasoning
| Ingredient | Quantity | Preparation |
| Crushed tomatoes | 1 can (15 oz / 425 g) | Unsalted preferred |
| Beef broth | ½ cup (120 ml) | Low sodium |
| Italian seasoning | 1 tablespoon | Dried |
| Salt | 1 teaspoon | Adjust to taste |
| Black pepper | 1 teaspoon | Adjust to taste |
Cheese Topping
| Ingredient | Quantity |
| Mozzarella cheese | 2½ cups (about 250 g) |
Freshly grated mozzarella is recommended for the best melting texture.
Step-by-Step Instructions
Prepare the Oven
Preheat your oven to 375°F (190°C).
Lightly grease a 9 × 13-inch (23 × 33 cm) baking dish with cooking spray or a small amount of olive oil.
Set aside.
Sauté the Vegetables
Heat the olive oil in a large skillet over medium-high heat.
Add the diced onion and green bell peppers.
Cook for approximately 5 minutes, stirring occasionally, until the vegetables begin to soften.
Brown the Ground Beef
Add the ground beef to the skillet.
Break it apart with a wooden spoon or spatula.
Cook for approximately 7–8 minutes, stirring regularly, until the beef is completely browned.
Drain excess fat or liquid from the skillet.
Add the Garlic
Stir the minced garlic into the beef and pepper mixture.
Cook for approximately 1 minute, stirring constantly.
The garlic should become fragrant without browning too much.
Add the Tomato Mixture
Pour in the crushed tomatoes and beef broth.
Add the Italian seasoning, salt, and black pepper.
Stir everything together until evenly combined.
Simmer the Filling
Reduce the heat to low.
Allow the mixture to simmer uncovered for approximately 8–10 minutes, stirring occasionally.
The sauce should become slightly thicker and coat the beef and vegetables rather than looking watery.
Transfer to the Baking Dish
Pour the cooked beef and green pepper mixture into the prepared baking dish.
Spread it into an even layer.
Add the Mozzarella
Sprinkle the shredded mozzarella evenly over the entire surface.
Try to cover the casserole from edge to edge for a beautifully cheesy finish.
Bake
Place the uncovered casserole in the preheated oven.
Bake for approximately 15–20 minutes, or until the mozzarella is completely melted, bubbling, and lightly golden.
If you prefer a darker cheese crust, place the casserole under the broiler for 1–2 minutes at the end.
Watch carefully because the cheese can brown quickly.
Rest and Serve
Remove the casserole from the oven.
Let it rest for approximately 5–10 minutes before serving.
This gives the juices time to settle and makes it easier to spoon into individual portions.
Best Tips
Dice the green peppers into similar-sized pieces so they cook evenly.
Do not skip draining excess fat from the beef. This helps keep the casserole rich without making it greasy.
Allow the tomato mixture to simmer until it thickens slightly. A thick filling produces a better casserole texture.
Freshly grated mozzarella generally melts more smoothly and creates a better cheese pull than many pre-shredded varieties.
Let the casserole rest before serving. Cutting into it immediately can make the portions more watery.
For a beautifully browned top, use the broiler briefly at the end and watch the casserole carefully.
Best Ingredient Options
Ground Beef
A 90% lean ground beef works particularly well because it provides plenty of flavor while limiting excess grease.
You can also use a slightly leaner blend if preferred.
Green Bell Peppers
Fresh, firm green bell peppers provide the classic flavor associated with stuffed peppers.
For a sweeter casserole, replace one green pepper with a red, yellow, or orange bell pepper.
Tomatoes
Crushed tomatoes create a smooth sauce throughout the casserole.
You can substitute diced tomatoes if you prefer a chunkier texture.
Mozzarella
Low-moisture mozzarella is particularly good for a golden, stretchy topping.
For more flavor, combine mozzarella with cheddar, Monterey Jack, or provolone.
Italian Seasoning
A homemade combination of dried oregano, basil, thyme, and parsley can be used instead of a prepared Italian seasoning blend.
Recipe Variations
Cheesy Beef and Pepper Rice Casserole
For a more substantial meal, serve the beef and pepper mixture over cooked white or brown rice before adding the cheese.
You can also mix cooked rice directly into the filling before transferring it to the baking dish.
Low-Carb Version
For a lower-carbohydrate casserole, simply omit the rice and serve the beef, peppers, tomato sauce, and cheese as written.
Spicy Beef and Pepper Casserole
Add ½ teaspoon of crushed red pepper flakes or a small amount of cayenne pepper to the tomato sauce.
For even more heat, add diced jalapeño peppers with the green bell peppers.
Mushroom Variation
Add 1 cup of sliced mushrooms to the skillet with the peppers and onions.
Cook until the mushrooms release their moisture and become tender.
Extra Cheesy Version
Add ½ cup of shredded cheddar to the mozzarella for a stronger, richer cheese flavor.
Creamy Variation
For a creamier casserole, stir ½ cup of softened cream cheese into the hot beef mixture before transferring it to the baking dish.
What to Serve With
This casserole is filling on its own, but a few simple side dishes can turn it into a complete family dinner.
A crisp green salad with a light vinaigrette provides a fresh contrast to the rich, cheesy casserole.
Steamed green beans, roasted broccoli, or asparagus are also excellent options.
If you are serving the casserole with rice, choose a simple seasoned rice or cauliflower rice to complement the tomato and beef flavors.
Warm dinner rolls or crusty bread are another delicious option for soaking up the savory tomato sauce.
Make-Ahead Instructions
This casserole can be prepared ahead of time for easier meal planning.
Prepare the beef and pepper mixture completely and allow it to cool slightly.
Transfer it to the baking dish, cover tightly, and refrigerate for up to 24 hours.
For the best texture, add the mozzarella shortly before baking.
When ready to cook, allow the chilled casserole to sit at room temperature briefly while the oven preheats.
Bake until the filling is hot throughout, then add the cheese and finish baking until golden and bubbly.
Storage
Allow leftovers to cool before transferring them to airtight containers.
Refrigerate for up to 4 days.
Individual portions are convenient for quick lunches and easy weekday dinners.
Reheating
Microwave
Place an individual portion on a microwave-safe plate.
Cover loosely and microwave for approximately 2–3 minutes, checking halfway through.
Continue heating until thoroughly hot.
Oven
Place the casserole in an oven-safe dish and cover loosely with aluminum foil.
Reheat at 350°F (175°C) for approximately 15–25 minutes, depending on the portion size.
Remove the foil during the final few minutes if you want the cheese to become bubbly again.
Freezing
This casserole can be frozen for up to 3 months.
Allow it to cool completely before transferring it to freezer-safe containers.
For convenient meal prep, freeze individual portions.
Thaw overnight in the refrigerator before reheating.
The peppers may become slightly softer after freezing, but the casserole will still be flavorful and satisfying.
Common Mistakes to Avoid
Using Watery Vegetables
Green peppers and tomatoes naturally contain moisture.
Cook the vegetable and beef mixture long enough to reduce excess liquid before transferring it to the baking dish.
Skipping the Beef Drain
Leaving excessive fat in the skillet can make the finished casserole greasy.
Drain the beef after browning when necessary.
Cutting the Peppers Too Large
Large pieces may remain firmer than the rest of the filling.
Dice the peppers into relatively small, uniform pieces for consistent cooking.
Adding Cheese Too Early
Adding mozzarella before the filling has finished cooking can cause the cheese to become overly browned.
Wait until the final baking stage.
Not Resting the Casserole
Allowing the casserole to rest for several minutes helps the sauce settle and makes serving easier.
Nutrition Estimate
Nutrition values are approximate and will vary according to the exact ingredients and portion size.
| Nutrient | Approximate Amount per Serving |
| Calories | 390 kcal |
| Protein | 31 g |
| Total Fat | 25 g |
| Saturated Fat | 11 g |
| Carbohydrates | 13 g |
| Dietary Fiber | 3 g |
| Sugars | 7 g |
| Cholesterol | 95 mg |
| Sodium | 620 mg |
Frequently Asked Questions
Can I use another type of ground meat?
Yes. Ground turkey or ground chicken can be substituted for ground beef.
The flavor will be lighter, but the vegetables, tomato sauce, and cheese will still create a delicious casserole.
Can I use red or yellow bell peppers?
Absolutely. Red, yellow, and orange peppers have a sweeter flavor and add beautiful color.
You can replace some or all of the green peppers.
Can I add rice?
Yes. Stir approximately 2–3 cups of cooked rice into the beef mixture before transferring it to the baking dish.
This turns the recipe into a more substantial stuffed-pepper-style rice casserole.
Can I make this casserole without cheese?
Yes. The casserole will still be flavorful without the cheese, although you will lose the creamy, golden topping.
Can I make it spicy?
Yes. Add crushed red pepper flakes, cayenne pepper, diced jalapeños, or your favorite hot sauce to the beef mixture.
Can I use pre-shredded mozzarella?
Yes, but freshly grated mozzarella usually gives the best melting texture.
How do I prevent the casserole from becoming watery?
Simmer the beef and tomato mixture until it thickens before transferring it to the baking dish.
Also drain excess liquid from the cooked beef and vegetables when necessary.
Is this casserole good for meal prep?
Yes. It stores well in the refrigerator and reheats easily, making it a practical option for weekly meal preparation.
Can I freeze individual portions?
Yes. Individual portions can be frozen in airtight freezer-safe containers for up to 3 months.
Final Thoughts
This Ultimate Cheesy Ground Beef and Green Pepper Casserole is an easy and satisfying twist on classic stuffed peppers.
With savory ground beef, tender green peppers, tomatoes, Italian seasoning, and bubbling mozzarella, every bite is packed with comforting flavor.
It is an excellent choice for easy family dinners, budget-friendly recipes, meal prep, and cozy weeknight cooking.
Prepare it ahead, bake it until golden and bubbly, and serve it with a fresh salad or your favorite vegetables for a delicious homemade dinner.