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Keto Breakfast Casserole with Peppers

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A delicious, low-carb keto breakfast casserole with bell peppers, cheddar cheese, onions, and mushrooms layered into a fluffy egg base. Perfect for meal prep or family brunches, this casserole offers vibrant color, mild crunch, and rich flavor without sacrificing keto compliance. High in protein and healthy fats to fuel your morning.

  • Total Time: 55
  • Yield: 8 servings 1x

Ingredients

Scale

10 large eggs
3 cups chopped bell peppers (red, yellow, or green)
1 cup diced yellow or white onion
1 cup sliced mushrooms
2 cups shredded cheddar cheese
2 tablespoons olive oil or avocado oil
1 teaspoon garlic powder
1 teaspoon paprika
1/2 teaspoon salt
1/2 teaspoon black pepper

Instructions

Preheat oven to 350°F (175°C)
Heat oil in a large oven-safe skillet or 8×8-inch baking dish over medium heat
Sauté onion and mushrooms for 3-5 minutes until softened
Add chopped bell peppers and sauté for 2-3 more minutes
In a separate bowl, whisk eggs with garlic powder, paprika, salt, and pepper
Pour egg mixture into the prepared skillet or dish
Toss in a bowl, combine all vegetable ingredients into the egg mixture
Transfer to oven and cook for 30-35 minutes until golden and lightly puffed
Let cool slightly before slicing into 8 portions

Notes

Use sharp cheddar for bolder flavor
Substitute mushrooms with zucchini or spinach for variety
Greens like arugula can be added without altering carb count
Cassette bakes better in an oven-safe skillet or cast iron Dutch oven
Store in an airtight container in the fridge for up to 3 days

  • Author: Sabella
  • Prep Time: 20
  • Cook Time: 35
  • Category: Breakfast
  • Method: Baking
  • Cuisine: American
  • Diet: Keto

Nutrition

  • Serving Size: 1 slice (about 180g)
  • Calories: 180
  • Sugar: 2g
  • Sodium: 100mg
  • Fat: 12g
  • Saturated Fat: 4g
  • Carbohydrates: 3.5g
  • Fiber: 1.2g
  • Protein: 13g
  • Cholesterol: 200mg