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Close-up of a high protein breakfast casserole with eggs, ham, and cheese baked until lightly golden.

High-Protein Egg Casserole

5 from 1 vote
This high-protein egg casserole is a simple breakfast bake made with eggs, ham, cheddar cheese, potato, and onion. It’s hearty, satisfying, and ideal for meal prep or an easy make-ahead breakfast.
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Prep Time 15 minutes
Cook Time 35 minutes
Total Time 50 minutes

Video

Servings : 6 servings

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Ingredients

  • 1 tbsp olive oil
  • 1 medium white potato, peeled and grated
  • 1 medium sweet onion, grated
  • 12 large eggs
  • ¾ cup milk, dairy or unsweetened plant-based
  • 1½ cups diced ham
  • 1½ cups shredded sharp cheddar cheese, I like to use a mix of classic cheddar and white cheddar.
  • 1 tsp salt
  • 1 tsp garlic powder
  • 1 tsp onion powder
Start Cooking

Instructions
 

  1. Preheat the oven to 375°F (190°C) and lightly grease a 9×13-inch baking dish with cooking spray or olive oil.
  2. Grate 1 medium white potato and 1 medium sweet onion. Heat 1 tbsp olive oil in a large skillet over medium heat and add both. Cook for 6 to 8 minutes, stirring occasionally, until softened and lightly golden. Remove from heat and let cool slightly.
    Grated potato and onion sautéed in a skillet as the base for a protein-packed breakfast casserole with eggs and ham.
  3. In a large bowl, whisk together the 12 large eggs, ¾ cup milk, 1 tsp salt, 1 tsp garlic powder, and 1 tsp onion powder until fully combined.
    Egg mixture for a high protein egg bake made without cottage cheese, featuring eggs, milk, ham, onion, and shredded potato in a mixing bowl.
  4. Stir the cooked potato mixture, 1½ cups diced ham, and 1½ cups shredded sharp cheddar cheese into the egg mixture until evenly distributed.
    High protein breakfast casserole with ham, cheddar cheese, and grated potato mixture poured into a baking dish for an easy make-ahead breakfast.
  5. Pour the mixture into the prepared baking dish and smooth the top with a spatula. You can also top with a bit of extra shredded cheese (optional).
    High protein egg casserole ready for meal prep, made with eggs, ham, shredded potato, and cheddar cheese in a baking dish before baking.
  6. Bake for 35 to 45 minutes, until the center is set and the top is golden. A knife inserted into the center should come out mostly clean.
    If you use a smaller but deeper baking pan like mine, you may need to add a bit of extra time.
    High protein egg casserole baked in a glass dish, cut into portions with a deeply golden, cheesy top.
  7. Let cool for 5 to 10 minutes before slicing into 6 servings.
    Slice of high protein breakfast casserole lifted from the baking dish, showing a soft, custardy egg interior.

Nutrition

Calories: 353kcalCarbohydrates: 13gProtein: 25gFat: 22gSaturated Fat: 9gPolyunsaturated Fat: 2gMonounsaturated Fat: 7gTrans Fat: 0.03gCholesterol: 375mgSodium: 1087mgPotassium: 383mgFiber: 1gSugar: 5gVitamin A: 809IUVitamin C: 8mgCalcium: 303mgIron: 2mg

Notes

  • Cheese swaps: Colby-Jack or mozzarella both work well.
  • Make it richer: Use whole milk or add an extra ¼ cup cheese on top before baking.
  • Meal prep: Stores well and reheats without drying out.