Name: Easy Vegetarian Breakfast Casserole
Prep time: 15 min
Cook time: 45 min
Total time: 60 min
Ingredients: 1 cup tomato (diced); 2 cups broccoli (finely chopped); 2 cups shredded cheddar cheese; 12 eggs; 1/4 tsp salt; 1/4 tsp black pepper; 1/4 tsp onion powder; 1 tsp red pepper flakes; 6 Morningstar Veggie Breakfast Sausage Patties (Optional )

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Last updated and expanded on May 29, 2026.

This Easy Vegetarian Breakfast Casserole is perfect for weekends! The prep time is less than 15 minutes and then you just throw it in the oven to bake. Super easy. It is packed full of protein and yummy veggies. Save the leftovers for week day mornings when you are too busy to cook. Individual casserole servings reheat well in the microwave. Sometimes we even freeze single servings and save for another week.

Why you’ll love this recipe:

Fast Prep Time: It takes less than 15 minutes of hands-on prep before you toss it in the oven.
Packed with Protein: A hearty mix of eggs, melted cheddar, and savory veggies keeps you full all morning.
Perfect for Meal Prep: The leftovers reheat beautifully, making weekday mornings completely stress-free.
Great for Families: It’s a sneaky, delicious way to get kids (and picky eaters) to eat their broccoli!

Make it Your Own: Veggie & Cheese Swaps

This recipe is a great “fridge clearer”—meaning you can toss in whatever vegetables you have on hand. While the broccoli and tomatoes provide a beautiful color and a nice nutritional boost, you can easily swap them out:

Leafy Greens: Try swapping the broccoli for fresh spinach or kale.
More Spice: Add some diced jalapeños or a dash of hot sauce into the egg mixture for an extra kick.
Cheese Variations: While shredded cheddar is a classic choice, pepper jack or feta would also taste amazing.

Tips for Making an Easy Vegetarian Breakfast Casserole

Avoid Soggy Casserole: To keep the casserole from getting too watery, make sure to dice your tomatoes finely and drain any excess juice before adding them to the eggs.
Finely Chopped Veggies: Using a food processor to chop the broccoli ensures that it cooks through evenly and blends perfectly with the egg and cheese.
Protein Boost: If you want an even heartier meal, crumble your favorite plant-based breakfast sausage into the egg mixture. Brand recommendation: We love using Morningstar Veggie Breakfast Sausage Patties for that classic, savory flavor!”

How to Reheat and Freeze

f you have leftovers, store them in an airtight container in the refrigerator for up to 4 days.

To Reheat: Simply pop a slice in the microwave for 45–60 seconds until warmed through.
To Freeze: Wrap individual slices tightly in parchment paper or foil, then place them together in a freezer-safe bag.
To Eat From Frozen: Let a slice thaw in the fridge overnight, or defrost it directly in the microwave using the defrost setting.

Can I Make This Casserole Ahead of Time?

Yes! This is an excellent recipe for meal prep or stress-free holiday mornings. You have two easy options for making it ahead:

Option 1 (Assemble and Refrigerate): Whisk your eggs, spices, cheese, and veggies together, pour the mixture directly into your greased 9×13 dish, and cover it tightly with foil. Store it in the fridge overnight. In the morning, let the dish sit on the counter for about 15 minutes to take the chill off while your oven preheats, then bake as directed. You may need to add 5–10 extra minutes to the bake time.

Option 2 (Bake and Reheat): Bake the casserole completely, let it cool to room temperature, and cover it. Slide it into the fridge, and then simply reheat individual slices throughout the week, or warm the entire dish back up in the oven at 350°F for about 15–20 minutes until hot.

What to Serve with This Casserole

While this vegetarian breakfast casserole is an entire meal on its own, it pairs beautifully with sweet or savory sides if you are hosting a weekend brunch. Here are a few Southern breakfast favorites to round out your breakfast table:

Freshly Baked Pastries: Balance out the savory, cheesy eggs with something sweet, like a slice of warm Easy Lemon Blueberry Croissant Breakfast Casserole or Easy Vegan Alabama Pecan Bread.

Biscuits and Jam: You can never go wrong with a basket of warm Vegan Drop Biscuits served with apple butter or fruit compote.

Vibrant Fruit Salad: A simple bowl of seasonal fresh fruit (like berries, melon, and citrus) cuts through the richness of the cheddar cheese perfectly.

Looking For More Breakfast Ideas?

Easy Vegetarian Breakfast Casserole

To make use a 9×13 casserole dish.

Course Breakfast

Cuisine Vegetarian

Keyword Casserole

Prep Time 15 minutes

Cook Time 45 minutes

Total Time 1 hour

Servings 12

Ingredients

1 cup tomato diced
2 cups broccoli finely chopped
2 cups shredded cheddar cheese
12 eggs
1/4 tsp salt
1/4 tsp black pepper
1/4 tsp onion powder
1 tsp red pepper flakes
6 Morningstar Veggie Breakfast Sausage Patties Optional

Instructions

Preheat the oven to 350 and lightly grease a 9×13 casserole baking dish.
Chop the broccoli (about 2 crowns) in the food processor this should yield about 2 cups of finely chopped broccoli. Dice 2 or 3 small tomatoes to yield one cup of diced tomatoes.
In a large mixing bowl whisk together a dozen eggs with salt, pepper, onion powder, and red pepper flakes.
Then add the veggies and shredded cheese to the eggs and mix together.
If you want to add the Morningstar veggie breakfast sausage place the frozen patties on a plate and microwave for one minute to defrost. Then you can chop them or crumble them and mix into the eggs.
When everything is mixed together pour it into the casserole dish and bake at 350 for 45 minutes.