Introduction
Welcome to your new favorite comfort food casserole recipe.
If you are searching for an easy weeknight dinner that satisfies the whole family, this hearty baked pasta dish is the ultimate solution.
Packed with savory ground beef, fresh green bell peppers, mushrooms, and a generous layer of melted cheese, this budget-friendly recipe delivers the comforting flavors of a restaurant-style meal at home.
Whether you need simple meal prep ideas or a delicious high-protein pasta bake for a crowd, this casserole delivers big flavor with minimal effort.
Recipe Overview
| Category | Detail |
| Prep Time | 15 minutes |
| Cook Time | 30 minutes |
| Total Time | 45 minutes |
| Servings | 6–8 servings |
| Dietary Style | High-Protein, Comfort Food |
| Oven Temperature | 375°F / 190°C |
Why You’ll Love This Recipe
This easy dinner recipe is perfect for busy families and anyone who wants a satisfying homemade meal without spending hours in the kitchen.
Affordable pantry staples, ground beef, fresh vegetables, tomato sauce, pasta, and melted cheese come together to create a flavorful and filling casserole.
The combination of al dente penne, savory beef, earthy mushrooms, sweet bell peppers, and rich marinara sauce makes every bite comforting and delicious.
The generous mozzarella and cheddar topping melts beautifully in the oven, creating a golden, bubbly cheese crust.
This casserole is also excellent for weekly meal prep because the leftovers store and reheat well.
Ingredients
🥩 Meat & Pasta
| Ingredient | Quantity | Notes |
| Ground beef | 1 lb / 450 g | 80/20 blend recommended |
| Penne pasta | 12 oz / 340 g | Cooked al dente |
| Olive oil | 1 tbsp / 15 ml | For sautéing |
🫑 Vegetables & Sauce
| Ingredient | Quantity | Notes |
| Green bell pepper | 1 large | Diced |
| White button mushrooms | 8 oz / 225 g | Sliced |
| Yellow onion | 1 medium | Finely chopped |
| Garlic | 3 cloves | Minced |
| Marinara sauce | 24 oz / 680 g | Good-quality sauce recommended |
🧀 Cheese & Seasoning
| Ingredient | Quantity | Notes |
| Mozzarella cheese | 2 cups / 200 g | Freshly shredded |
| Cheddar cheese | 1 cup / 100 g | Freshly shredded |
| Italian seasoning | 1 tbsp / 15 g | Dried |
| Salt | To taste | |
| Black pepper | To taste | |
| Fresh parsley | 1 tbsp | Chopped, for garnish |
Step-by-Step Instructions
Step 1: Prepare the Oven and Pasta
Preheat your oven to 375°F / 190°C.
Lightly grease a 9 × 13-inch baking dish.
Bring a large pot of generously salted water to a boil.
Add the penne pasta and cook according to the package directions until al dente, usually about 9–10 minutes.
Drain the pasta well and set it aside.
Avoid overcooking the pasta because it will continue cooking in the oven.
Step 2: Sauté the Vegetables
Heat the olive oil in a large skillet over medium-high heat.
Add the diced onion and green bell pepper.
Cook for approximately 4 minutes, stirring occasionally, until the vegetables begin to soften.
Add the sliced mushrooms and cook for another 3 minutes.
The mushrooms should release their moisture and become lightly browned.
Step 3: Brown the Ground Beef
Push the vegetables toward the sides of the skillet.
Add the ground beef to the center.
Break the beef apart with a wooden spoon and cook until thoroughly browned and no longer pink.
This should take approximately 5–7 minutes.
Drain excess grease from the skillet if necessary.
Step 4: Build the Tomato Sauce
Add the minced garlic and Italian seasoning to the skillet.
Cook for approximately 1 minute, stirring until fragrant.
Pour in the marinara sauce.
Season with salt and black pepper according to taste.
Reduce the heat to low and simmer for approximately 5 minutes.
This short simmer allows the beef, vegetables, herbs, and tomato sauce to develop a deeper flavor.
Step 5: Combine the Pasta and Sauce
Add the cooked penne to a large mixing bowl.
Pour the beef and vegetable sauce over the pasta.
Gently stir until every piece of pasta is evenly coated with the savory tomato sauce.
Transfer the mixture to the prepared 9 × 13-inch baking dish.
Spread everything into an even layer.
Step 6: Add the Cheese and Bake
Sprinkle the shredded mozzarella evenly over the pasta.
Add the shredded cheddar on top.
Place the casserole uncovered in the preheated oven.
Bake for approximately 20–25 minutes, or until the cheese is completely melted, bubbling, and lightly golden.
For a deeper golden crust, you can use the broiler for the final 1–2 minutes, watching carefully.
Step 7: Garnish and Serve
Remove the casserole from the oven.
Allow it to rest for approximately 5 minutes before serving.
This short resting period allows the sauce to settle and makes the casserole easier to portion.
Sprinkle freshly chopped parsley over the top.
Serve hot and enjoy.
Best Tips
Shred your own mozzarella and cheddar from a block whenever possible. Freshly shredded cheese usually melts more smoothly.
Cook the penne only until al dente. Overcooked pasta can become soft and mushy during baking.
Drain excess grease from the ground beef before adding the marinara sauce.
Season the pasta water generously to give the penne more flavor.
Allow the casserole to rest for 5–10 minutes after baking so the portions hold together more easily.
For an especially golden cheese topping, briefly broil the casserole at the end while watching it carefully.
Best Ingredient Options
For a rich and flavorful casserole, a good-quality marinara sauce works especially well.
An 80/20 ground beef blend provides plenty of flavor and moisture. If you prefer a leaner option, use lean ground beef and adjust the cooking time as needed.
Cremini or baby bella mushrooms can replace white button mushrooms for a deeper, earthier flavor.
Freshly shredded mozzarella gives the best melted cheese texture.
A sharp cheddar can be used if you prefer a stronger cheese flavor.
Recipe Variations
🌶️ Spicy Beef Pasta Bake
Add ½ teaspoon of crushed red pepper flakes to the marinara sauce.
You can also replace some of the cheddar with pepper jack cheese for extra heat.
🥦 Vegetable-Loaded Casserole
Add chopped zucchini, spinach, broccoli, extra mushrooms, or diced carrots for additional vegetables.
🍗 Lean Protein Version
Replace the ground beef with lean ground turkey or ground chicken.
For a higher-fiber option, use whole-wheat or chickpea pasta.
🧀 Creamy Cheese Casserole
Stir approximately ½ cup of heavy cream or softened cream cheese into the beef and marinara sauce before combining it with the pasta.
This creates an especially rich and creamy casserole.
🍅 Extra-Tomato Version
Add a small amount of tomato paste to the beef mixture before adding the marinara sauce for a deeper tomato flavor.
What to Serve With
This hearty casserole pairs beautifully with a crisp green salad or Caesar salad.
Garlic bread is another excellent choice for soaking up the flavorful tomato sauce.
Warm breadsticks can also make the meal feel extra comforting.
For a balanced dinner, serve the casserole with roasted asparagus, steamed broccoli, green beans, or another simple vegetable side dish.
Make-Ahead Instructions
You can assemble this casserole up to 24 hours in advance.
Prepare the pasta, beef sauce, and vegetables as directed.
Combine everything in the baking dish and add the cheese topping.
Cover the dish tightly with aluminum foil or plastic wrap and refrigerate.
When ready to bake, remove the plastic wrap.
Bake at 375°F / 190°C.
Because the casserole will be chilled, add approximately 10–15 minutes to the baking time.
Make sure the center is thoroughly hot before serving.
Storage
Transfer leftover casserole to an airtight container.
Store it in the refrigerator for up to 4 days.
Allowing the casserole to cool slightly before refrigerating helps reduce excess condensation.
For convenient meal prep, divide the leftovers into individual portions before storing.
Reheating
For individual servings, place the casserole on a microwave-safe plate.
Cover it with a damp paper towel and microwave for approximately 60–90 seconds, or until heated through.
For larger portions, place the casserole in a baking dish and cover it loosely with aluminum foil.
Reheat at 350°F / 175°C for approximately 15–20 minutes.
Adding a small splash of water or a spoonful of extra marinara sauce before reheating can help prevent the pasta from drying out.
Freezing
This baked pasta casserole is freezer-friendly and can be stored for up to 3 months.
For the best texture, freeze the casserole before baking whenever possible.
Assemble the casserole in a freezer-safe or disposable aluminum baking dish.
Wrap it tightly with plastic wrap, followed by a layer of heavy-duty aluminum foil.
Label and date the dish before placing it in the freezer.
Thawing and Baking
For the best results, thaw the casserole overnight in the refrigerator.
Bake at 375°F / 190°C until completely heated through and the cheese is bubbling.
You can also bake it directly from frozen.
Keep it covered with foil and bake at 375°F / 190°C for approximately 60–75 minutes, then uncover during the final portion of cooking so the cheese can brown.
Always make sure the center is thoroughly hot before serving.
Common Mistakes to Avoid
Overcooking the pasta: Penne should remain al dente because it continues cooking in the oven.
Failing to drain excess beef grease: Too much fat can make the sauce oily.
Under-seasoning the dish: Season the pasta water and taste the beef sauce before assembling the casserole.
Adding the cheese too early: The cheese should be added immediately before baking to achieve the best melted topping.
Skipping the resting period: Allowing the casserole to rest for several minutes helps the sauce settle and makes serving easier.
Burning the cheese under the broiler: If you use the broiler, watch the casserole continuously because the cheese can brown very quickly.
Nutrition Estimate
Approximate values per serving, depending on portion size and ingredients used.
| Nutrient | Amount per Serving |
| Calories | 485 kcal |
| Total Fat | 22 g |
| Saturated Fat | 10 g |
| Cholesterol | 75 mg |
| Sodium | 680 mg |
| Total Carbohydrates | 42 g |
| Dietary Fiber | 4 g |
| Sugars | 6 g |
| Protein | 30 g |
Nutrition values are estimates and can vary depending on the specific brands, ingredient quantities, and serving sizes.
Frequently Asked Questions
Can I use a different type of pasta?
Yes.
Penne can easily be replaced with ziti, rigatoni, rotini, fusilli, or macaroni.
Choose a pasta shape that can hold plenty of sauce.
Can I prepare individual freezer portions?
Absolutely.
Divide the cooled casserole into individual freezer-safe containers for convenient meal prep.
This makes it easy to have homemade portions ready for busy weekdays.
How do I get a perfectly golden cheese crust?
Bake the casserole until the cheese is fully melted.
If you want additional browning, switch the oven to broil for the final 1–2 minutes.
Keep a close eye on it because cheese can burn quickly under a broiler.
Can I use ground turkey instead of beef?
Yes.
Ground turkey can be substituted for ground beef if you prefer a leaner protein option.
Because turkey is generally leaner, avoid overcooking it so the filling remains moist.
Can I add more vegetables?
Definitely.
Mushrooms, zucchini, spinach, broccoli, bell peppers, and carrots can all work well in this casserole.
Can I make this casserole without mushrooms?
Yes.
Simply omit the mushrooms and add another vegetable, or increase the amount of bell pepper and onion.
Final Thoughts
This Ultimate Cheesy Beef and Mushroom Penne Casserole proves that an incredible family dinner does not need to be complicated or expensive.
Tender penne, savory ground beef, mushrooms, colorful bell peppers, rich marinara sauce, and plenty of melted cheese come together to create a satisfying homemade comfort food meal.
It is perfect for busy weeknights, family dinners, meal preparation, and casual gatherings.
Best of all, the leftovers reheat beautifully, making this cheesy beef pasta bake a recipe you will want to keep in your regular dinner rotation.