Looking for a nutritious, quick, and delicious way to start your day? This easy veggie omelet casserole is the answer. Perfect for busy mornings, lazy brunches, or healthy meal prep, this dish combines fluffy eggs, fresh vegetables, and melty cheese into a comforting, protein-packed meal.

Not only is it customizable, but it’s also a great option for anyone looking to eat cleaner, reduce carbs, or simply enjoy more veggies. And if you’re curious about the benefits of eggs beyond the taste, you’ll be glad to know that they are one of the most nutrient-dense foods you can eat. For more on this, check out the nutritional value of eggs.

Want to get the most out of your veggies? Make sure you’re prepping them right by following these vegetable storage and prep tips. That way, your casserole stays flavorful, not soggy!

Why You’ll Love This Omelet Casserole

Protein-packed and satisfying
Great for meal prep or feeding a crowd
Totally customizable with what’s in your fridge
Works for various diets (keto, gluten-free, vegetarian)

Ingredients You’ll Need

Here’s what goes into this easy veggie omelet casserole:

10 large eggs
½ cup milk (or heavy cream for extra richness)
1 cup shredded cheese (cheddar, mozzarella, or your favorite)
1 cup cherry tomatoes, halved
1 cup broccoli florets, chopped
½ cup bell peppers, diced
½ cup onions, diced
2 cloves garlic, minced
1 tsp salt
½ tsp black pepper
½ tsp paprika (optional)
½ tsp oregano or Italian seasoning
2 tbsp olive oil or butter
Fresh parsley or chives for garnish

Equipment Checklist

To make this recipe seamless, have the following ready:

9×13-inch baking dish
Large mixing bowl
Whisk and spatula
Sauté pan for vegetables

How to Make the Perfect veggie omelet casserole

Preheat oven to 375°F (190°C). Lightly grease your baking dish.
Sauté veggies: Heat olive oil or butter in a skillet. Add onions, bell peppers, and garlic. Cook for 3 minutes. Add broccoli and cook for another 2 minutes.
Whisk eggs, milk, salt, pepper, paprika, and herbs in a large bowl. Stir in shredded cheese.
Assemble: Pour egg mixture into the baking dish. Evenly distribute sautéed veggies. Top with cherry tomatoes.
Bake for 25–30 minutes or until center is fully set and top is slightly golden.
Cool and garnish with chopped parsley or chives before serving.

Pro Tips for a Flawless veggie omelet casserole

Use fresh vegetables for best flavor and texture.
Drain high-moisture veggies like tomatoes or zucchini to prevent sogginess.
Pre-sauté firmer vegetables like broccoli and onions for better texture.
Want to prep ahead? Assemble the night before and bake in the morning.

Make It Your Own: Variations & Add-ins

This veggie casserole is like a blank canvas. Here are ways to switch it up:

Add-ins:
- Spinach, zucchini, or mushrooms
- Cooked bacon, turkey sausage, or ham
Cheese Combos:
- Feta for tang
- Pepper jack for heat
- Goat cheese for creaminess
Add flavor boosts:
- Sun-dried tomatoes
- Basil or thyme
- A sprinkle of Parmesan before baking

For more breakfast prep inspiration, browse through these make-ahead breakfast ideas.

Meal Prep, Storage & Reheating

Refrigerate: Store in an airtight container for up to 4 days.
Freeze: Let cool, portion, and wrap in plastic or foil. Freeze for up to 2 months.
Reheat: Microwave individual slices or warm in the oven at 350°F.

Nutrition Snapshot (Per Serving)

Calories: ~220
Protein: ~14g
Carbs: ~5g
Fat: ~15g

This makes it an excellent choice for those on a keto or low-carb diet.

Serving Suggestions

Pair your casserole with:

Avocado slices
Whole grain toast or low-carb bread
Fresh fruit or green salad

Frequently Asked Questions

Can I make this dairy-free?
Yes! Use almond or oat milk, and substitute cheese with a dairy-free alternative or skip it altogether.

Can I freeze it?
Definitely. Let it cool completely, then portion and freeze. Great for batch cooking.

How do I know it’s fully cooked?
The center should be firm, not jiggly. Insert a toothpick—if it comes out clean, it’s ready.

Is it keto-friendly?
Absolutely. Use heavy cream and avoid high-carb veggies like carrots or corn.

Can I use frozen vegetables?
Yes, but thaw and drain them to avoid extra moisture.

Can I make it in an air fryer?
Yes, if your air fryer has a bake setting and large capacity. Use a small casserole dish and adjust cooking time.

What size dish should I use?
A 9×13-inch baking dish is standard. For thicker slices, use an 8×8-inch and bake slightly longer.

Can I prep this the night before?
Yes! Assemble everything and refrigerate. Bake in the morning for a hot breakfast without the mess.

Final Thoughts

This easy veggie omelet casserole is the kind of meal that brings comfort without the chaos. It’s healthy, adaptable, and guaranteed to please even picky eaters. Make it your own with favorite add-ins, and you’ll never look at breakfast the same way again.