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Vegetarian Breakfast Casserole

This vegetarian breakfast casserole is the perfect healthy breakfast recipe to feed a crowd or to make-ahead for a quick breakfast during the week! Not only is this recipe vegetarian but it's also high in protein and low carb friendly. So if you're looking to eat more vegetables and protein, then this is a great recipe to add to your meal plan!
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Prep Time: 25 minutes
Cook Time: 45 minutes
Total Time: 1 hour 10 minutes
Servings: 12
Calories: 118kcal
Author: Organize Yourself Skinny


  • 12 large eggs
  • 2 tablespoons olive oil divided
  • 8 ounce package sliced mushrooms
  • 1 bell pepper chopped
  • 1 medium white onion chopped
  • 1 cup frozen broccoli
  • ½ cup 1% milk
  • 1 teaspoon garlic powder
  • 1 teaspoon onion powder
  • 1 teaspoon salt
  • 1 teaspoon pepper
  • 1 cup shredded sharp cheddar cheese


  • Preheat oven to 350 degrees.
  • Spray in a 9 x 13 baking dish and set aside.
  • In a medium sauté pan heat 1 tablespoon of olive oil over medium heat. Add the sliced mushrooms and cook until tender, about 5 minutes. Place the cooked mushrooms into the baking dish.
  • Using the same pan, heat the last tablespoon of olive oil over medium heat. Add the onion and bell pepper and cook until onion is translucent and both vegetables are tender.
  • While the onions and peppers are cooking heat the broccoli in the microwave until it's heated through. Then add the broccoli to the pan with the onions and peppers. Break up the broccoli into small pieces as it cooks completely.
  • Place the rest of the vegetables into the baking dish.
  • In a large mixing bowl (you can do this step while the vegetables are cooking) whisk the eggs, milk, garlic powder, onion powder, salt, and pepper.
  • Pour the egg mixture over the vegetables and then give it a couple slow stirs.
  • Place the dish into the oven and bake for 40 - 45 minutes or until the center is set.
  • Serve warm.


Serving: 1g | Calories: 118kcal | Carbohydrates: 4g | Protein: 10g | Fat: 7g | Saturated Fat: 3g | Fiber: 1g | Sugar: 2g