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A serving of breakfast casserole has been placed on a round black plate over a wooden tabletop.

Vegetarian Breakfast Casserole

Gooey cheese, slightly sweet peppers, flavorful mushrooms, and a not-so-secret ingredient come together to make this easy Vegetarian Breakfast Casserole an surefire hit.
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Prep Time: 5 minutes
Cook Time: 55 minutes
Total Time: 1 hour
Servings: 8

Ingredients 

  • 1 tablespoon olive oil
  • ½ large yellow onion chopped into ¼ inch pieces, about 1 cup
  • 1 small red bell pepper chopped into ½ inch pieces, about 1 cup
  • 1 small green bell pepper chopped into ½ inch pieces, about 1 cup
  • 8 ounces fresh mushrooms sliced thin, about 3 cups
  • 1½ teaspoons kosher salt divided
  • ½ teaspoon freshly ground black pepper pepper
  • 30 ounces frozen tater tots
  • 2 cups shredded Mexican blend cheese or cheddar cheese divided
  • 8 eggs
  • 1 cup milk
  • ½ teaspoon granulated garlic or garlic powder
  • ½ teaspoon granulated onion or onion powder
  • 2 tablespoons fresh Italian parsley or cilantro chopped small

Instructions

  • Preheat the oven to 350ºF. Grease a 9x13 baking dish with butter and set aside. In a large skillet over medium-high heat, warm the oil. Add the onion and bell pepper and cook while stirring frequently for about 3 minutes, until the vegetables begin to soften.
  • Add the mushrooms and continue cooking for about 5 minutes longer. Season the vegetables with ½ teaspoon salt and pepper.
  • Place the tater tots in the baking dish, along with the cooked vegetables and 1½ cups of cheese. Stir to combine.
  • In a medium-sized bowl, combine the eggs, milk, 1 teaspoon salt, garlic and onion powder. Pour the egg mixture over the tater tots in the baking dish and top with the remaining ½ cup of cheese.
  • Bake for 55-60 minutes until the eggs have set and the top is golden brown around the edges. Serve warm, sprinkled with parsley or cilantro.

Nutrition

Calories: 412kcal · Carbohydrates: 33g · Protein: 17g · Fat: 25g · Saturated Fat: 9g · Polyunsaturated Fat: 5g · Monounsaturated Fat: 9g · Trans Fat: 0.02g · Cholesterol: 194mg · Sodium: 1162mg · Potassium: 567mg · Fiber: 4g · Sugar: 4g · Vitamin A: 997IU · Vitamin C: 39mg · Calcium: 267mg · Iron: 2mg
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