Got a casserole dish? This easy and savory Chicken Fajita Breakfast Casserole combines chicken breakfast sausage, sautéed peppers and onions, potatoes and eggs into a flavorful bake that’s perfect for feeding a crowd or prepping breakfasts for the week. It’s protein-packed, full of fajita flavor, and simple to assemble.
Fajita Breakfast Casserole Ingredients
These ingredients are straightforward and likely already in your kitchen. Chop the chicken sausage, peppers, onion and potato into bite-sized pieces—then everything goes into a baking dish.
- 1 medium Idaho potato (or substitute another variety), diced into 1/2-inch chunks
- 1/2 medium jalapeño, minced (adjust to taste)
- 2 tablespoons fajita seasoning, divided
- 10 large eggs
- 1/4 cup unsweetened almond milk (or any unflavored milk)
- 6 links precooked chicken breakfast sausage, chunked (about 4.5 oz.)
- 1 medium red bell pepper, finely diced
- 1 medium green bell pepper, finely diced
- 1/2 medium white onion, finely diced
- 1/3 cup shredded Colby Jack cheese
- Salt and pepper to taste
Homemade Fajita Seasoning
If you don’t have a store-bought fajita packet, make a simple mix at home from these pantry spices. This avoids added fillers and lets you control the salt level.
- Chili powder
- Ground cumin
- Garlic powder
- Paprika
- Salt
- Pepper
Mix those spices to taste—start with roughly 1 tablespoon chili powder, 1 teaspoon cumin, 1 teaspoon garlic powder, 1 teaspoon paprika and salt and pepper to your preference, then adjust. Use 2 tablespoons total for this recipe, divided as directed.
How To Make the Perfect Fajita Breakfast Casserole
Step 1
Preheat your oven to 400ºF (204ºC). Spray an 8×8-inch baking dish with nonstick cooking spray or lightly grease with oil.
Step 2
Dice the potato into 1/2-inch chunks and mince the jalapeño. Place them in the prepared baking dish, drizzle with a little olive oil, and sprinkle about 1/2 teaspoon of the fajita seasoning over the top. Roast at 400ºF for 10 minutes to start the potatoes cooking and to soften the jalapeño.
Step 3
While the potatoes roast, whisk together 10 eggs and 1/4 cup unsweetened almond milk (or your preferred milk). Set that mixture aside. Finely dice the red and green peppers and the white onion.
Step 4
After the potatoes and jalapeño have baked for 10 minutes, reduce the oven temperature to 350ºF (177ºC). Add the diced peppers, onion and the chunked precooked chicken sausage into the baking dish. Sprinkle the remaining fajita seasoning over everything and toss gently to coat evenly.
Step 5
Pour the egg and milk mixture over the sausage and vegetables, using a spoon or spatula to mix slightly so the eggs distribute through the pan.
Step 6
Bake at 350ºF for 40 minutes. Remove from the oven, sprinkle the shredded Colby Jack cheese on top, then return to the oven for an additional 5 minutes or until the cheese melts and the eggs are set.
Step 7
Let the casserole cool for at least 10 minutes before slicing. This helps it hold its shape and makes serving easier. Enjoy warm.
Tips & Notes
- Substitutions: Use any potato you have on hand. Swap almond milk for regular milk or a dairy-free alternative you prefer.
- Spice level: Adjust jalapeño and seasoning to control heat. Omit jalapeño for a milder dish.
- Make-ahead: Assemble the casserole the night before and refrigerate, then bake in the morning (you may need a few extra minutes if baked cold).
- Storage: Leftovers will keep in the refrigerator for up to 4 days. Reheat in the oven or microwave until warmed through.
- Serving: This casserole is great on its own or served with fresh salsa, avocado slices, or a light side salad.
More Breakfast Ideas
If you like egg-based breakfast bakes, try variations such as egg cups, breakfast sandwiches, or quiches using similar ingredients—swap in turkey or pork sausage, add leafy greens like spinach, or use sweet potato for a different base.
Nutrition (Approximate)
Per serving (serves 6): Calories: 281 kcal • Carbohydrates: 12 g • Protein: 19 g • Fat: 17 g • Fiber: 2 g • Sugar: 4 g
Nutrition information is automatically calculated and should be used as an approximation.