This Cheesy Broccoli, Cauliflower and Vegetable Bake is a comforting, colorful, and easy side dish packed with tender-crisp vegetables, creamy egg custard, garlic, and plenty of melted cheese.
Broccoli and cauliflower are lightly blanched before being combined with onion and sweet red bell pepper. Everything is coated in a creamy mixture of eggs, cream, milk, garlic, and nutmeg, then baked until golden, bubbling, and beautifully cheesy.
It is an excellent choice for a family dinner, holiday table, vegetarian meal, or simple weeknight side dish.
Recipe Overview
| Category | Details |
| Prep Time | 15 minutes |
| Vegetable Cooking Time | 4–5 minutes |
| Baking Time | 25–30 minutes |
| Total Time | 45–50 minutes |
| Servings | 6 |
| Cuisine | Comfort Food |
| Main Ingredients | Broccoli & Cauliflower |
| Cooking Method | Blanching & Baking |
| Oven Temperature | 190°C / 375°F |
Why You’ll Love This Recipe
This vegetable bake is an easy way to turn everyday vegetables into a comforting and flavorful dish.
The broccoli and cauliflower remain slightly firm before baking, giving the finished gratin a pleasant texture instead of becoming overly soft.
The creamy egg mixture brings everything together while garlic and nutmeg add warmth and depth of flavor.
A generous layer of melted cheese creates a golden, bubbling topping that makes the vegetables especially satisfying.
Ingredients
For the Vegetable Gratin
| Ingredient | Amount |
| Broccoli florets | 300 g |
| Cauliflower florets | 300 g |
| Red bell pepper | 1, sliced |
| Onion | 1, thinly sliced |
| Shredded cheese | 200 g |
| Fresh parsley | For garnish |
For the Creamy Egg Mixture
| Ingredient | Amount |
| Eggs | 3 |
| Heavy cream | 200 ml |
| Milk | 100 ml |
| Garlic, minced | 1 clove |
| Ground nutmeg | ½ teaspoon |
| Salt | To taste |
| Freshly ground black pepper | To taste |
Step-by-Step Instructions
1. Prepare the Vegetables
Bring a large pot of salted water to a boil.
Add the broccoli and cauliflower florets and blanch for approximately 4–5 minutes.
You can also steam the vegetables until they are slightly tender but still firm.
Drain them very well and allow excess moisture to evaporate.
Keeping the vegetables slightly crisp at this stage prevents them from becoming mushy during baking.
2. Prepare the Creamy Egg Mixture
In a large mixing bowl, whisk together the eggs, heavy cream, milk, minced garlic, ground nutmeg, salt, and black pepper.
Whisk until the mixture is smooth and evenly combined.
3. Preheat the Oven
Preheat your oven to 190°C (375°F).
Lightly grease a glass or ceramic baking dish with butter or cooking oil.
4. Assemble the Vegetables
Arrange the blanched broccoli and cauliflower evenly in the prepared baking dish.
Add the sliced onion and red bell pepper, distributing them throughout the vegetables.
For an alternative flavor, you can replace the red bell pepper with sliced tomatoes.
5. Add the Cream Mixture
Pour the egg and cream mixture evenly over the vegetables.
Gently shake the baking dish or use a spatula to help distribute the mixture between the vegetables.
6. Add the Cheese
Sprinkle the shredded cheese generously over the entire surface.
Mozzarella, Emmental, and Gouda all work beautifully in this recipe.
7. Bake
Place the baking dish in the preheated oven.
Bake for 25–30 minutes, or until the center is set and the cheese is melted, bubbling, and golden brown.
If the cheese starts browning too quickly, loosely cover the dish with aluminum foil for part of the baking time.
8. Garnish and Serve
Remove the gratin from the oven and allow it to rest for approximately 5 minutes.
Sprinkle freshly chopped parsley over the top.
Serve warm as a side dish or as a light vegetarian main course.
Best Tips
Drain the broccoli and cauliflower thoroughly before assembling the gratin. Excess water can make the finished dish watery.
Do not overcook the vegetables during blanching because they will continue cooking in the oven.
For an especially creamy gratin, use full-fat cream and milk.
Freshly shredded cheese usually melts more smoothly than pre-shredded cheese.
Let the gratin rest for a few minutes after baking so the creamy egg mixture can set slightly.
Best Ingredient Options
Cheese
Mozzarella creates a mild, stretchy topping.
Emmental provides a slightly nutty flavor and excellent melting quality.
Gouda gives the gratin a rich, creamy flavor.
You can also combine two or more cheeses for a more complex taste.
Vegetables
Broccoli and cauliflower form the base of the recipe, but you can add zucchini, mushrooms, spinach, carrots, or peas.
Red Pepper
Red bell pepper adds sweetness and color. Sliced tomatoes can be used instead for a more Mediterranean-style flavor.
Recipe Variations
For a richer gratin, add a few tablespoons of cream cheese to the egg mixture.
For extra flavor, sauté the onion and garlic in a little olive oil before adding them to the baking dish.
For a spicy version, add a pinch of red pepper flakes or paprika to the creamy mixture.
For a Mediterranean twist, add cherry tomatoes, dried oregano, and a little crumbled feta cheese.
For extra protein, add cooked chicken, turkey, or chickpeas to turn the gratin into a more substantial meal.
What to Serve With
This cheesy vegetable gratin pairs beautifully with roasted chicken, grilled beef, or baked fish.
For a vegetarian dinner, serve it with a fresh green salad and crusty whole-grain bread.
It also works wonderfully as a side dish alongside roasted potatoes or rice.
Make-Ahead Instructions
You can blanch the vegetables and prepare the creamy egg mixture several hours in advance.
Store both separately in the refrigerator until ready to assemble.
For best results, assemble the gratin shortly before baking.
Storage
Allow leftovers to cool before transferring them to an airtight container.
Store in the refrigerator for up to 3–4 days.
Reheating
Reheat individual portions in the microwave until hot.
For the best texture, reheat the gratin in a 175°C (350°F) oven until warmed through and the cheese becomes bubbly again.
If the top begins to brown too much during reheating, cover it loosely with foil.
Freezing
The gratin can be frozen, although the vegetables may become slightly softer after thawing.
For best quality, freeze it in an airtight freezer-safe container for up to 2 months.
Thaw overnight in the refrigerator before reheating.
Common Mistakes to Avoid
Do not boil the vegetables for too long because they can become soft and watery.
Avoid skipping the draining step after blanching.
Do not add too much liquid to the baking dish because the vegetables naturally release some moisture during cooking.
Avoid using an overly salty cheese if you are already seasoning the egg mixture generously.
Do not cut into the gratin immediately after removing it from the oven. Allowing it to rest for a few minutes helps the creamy filling set.
Nutrition Estimate
Nutrition values are approximate and will vary depending on the cheese, cream, and serving size.
| Nutrient | Approximate Amount per Serving |
| Calories | 300–350 kcal |
| Protein | 15–18 g |
| Carbohydrates | 15–20 g |
| Fat | 20–24 g |
| Saturated Fat | 10–14 g |
| Fiber | 4–6 g |
| Sodium | 500–750 mg |
Frequently Asked Questions
Can I use frozen broccoli and cauliflower?
Yes. Frozen vegetables can be used, but thaw and drain them thoroughly before assembling the gratin to prevent excess moisture.
Can I use only mozzarella?
Absolutely. Mozzarella creates a deliciously stretchy and mild cheese topping.
Can I prepare this gratin without cream?
Yes. You can replace some or all of the cream with additional milk, although the finished gratin will be lighter and less rich.
Can I add meat?
Yes. Cooked chicken, turkey, or beef can be added to make this vegetable bake more filling.
Why is my gratin watery?
The most common reason is excess moisture from the vegetables. Make sure the broccoli and cauliflower are thoroughly drained before assembling the dish.
Can I make this recipe ahead of time?
Yes. You can prepare the vegetables and creamy mixture in advance and refrigerate them separately until ready to assemble and bake.
Can I use another cheese?
Yes. Cheddar, Gruyère, Monterey Jack, or a combination of cheeses can work very well.
Final Thoughts
This Cheesy Broccoli, Cauliflower and Vegetable Bake is a simple and delicious way to enjoy more vegetables while still getting plenty of creamy, cheesy comfort.
With tender-crisp broccoli and cauliflower, colorful peppers and onions, a creamy garlic-and-nutmeg egg mixture, and a golden layer of melted cheese, this gratin makes an easy and satisfying addition to almost any dinner table.