Ground Turkey Breakfast Casserole with Eggs and Potatoes

This ground turkey breakfast casserole layers browned turkey, shredded potatoes, vegetables, eggs, and cheddar in one hearty, sliceable bake. It is an American-style breakfast casserole that works for brunch or a make-ahead breakfast, and the turkey and potatoes make it filling without requiring separate skillets at serving time.

Ingredients

1 tablespoon (15 ml) olive oil
1 pound (454 g) lean ground turkey
1 small yellow onion, finely diced, about 1 cup (150 g)
1 medium red bell pepper, diced, about 1 cup (150 g)
2 cloves garlic, minced, about 2 teaspoons (6 g)
1 teaspoon (3 g) kosher salt, divided
½ teaspoon (1 g) black pepper, divided
½ teaspoon (1 g) smoked paprika
20 ounces (567 g) refrigerated shredded potatoes
2 cups (226 g) shredded sharp cheddar cheese, divided
10 large eggs
1 cup (240 ml) whole milk
2 tablespoons (8 g) chopped fresh chives, plus extra for serving if desired
½ teaspoon (1 g) dry mustard powder
Cooking spray or a little oil for greasing the baking dish, about 1 teaspoon (5 ml)

Instructions

Heat the oven to 375°F (190°C). Lightly grease a 9-by-13-inch (23-by-33-cm) baking dish. If the shredded potatoes look wet, spread them on a clean towel and gently press out excess moisture; this helps the casserole set rather than steam. Keep the potatoes refrigerated while you prepare the other ingredients.
Warm the olive oil in a large skillet over medium heat. Add the ground turkey and break it into small pieces with a spatula. Sprinkle on about half the salt and pepper. Cook for 5 to 7 minutes, stirring and breaking up any large clumps, until no pink remains. Check the thickest pieces with a food thermometer: USDA FSIS lists 160°F (71°C) as the safe minimum temperature for ground meat. Transfer the cooked turkey to a plate. If there is a lot of liquid in the pan, drain it carefully; leave a thin coating of oil for the vegetables.
Add the diced onion and bell pepper to the same skillet. Cook for 4 to 5 minutes, stirring occasionally, until the onion has softened and the pepper is beginning to tenderize. Stir in the garlic and smoked paprika and cook for about 30 seconds, just until fragrant. Take the skillet off the heat and stir the turkey back in. Taste a small piece and add a pinch more salt or pepper if needed.
In a large bowl, whisk the eggs with the milk, remaining salt and pepper, dry mustard, and chives until the yolks and whites are thoroughly combined. Whisking well helps the seasoning distribute evenly; there should not be long streaks of egg white in the mixture. Stir in about 1½ cups (170 g) of the cheddar, saving the rest for the top.
Scatter the shredded potatoes evenly across the prepared baking dish. Spoon the turkey and vegetable mixture over the potatoes, spreading it into an even layer. Pour the egg mixture over everything slowly, moving around the dish so it reaches the corners. Sprinkle the remaining ½ cup (56 g) cheddar evenly over the surface.
Bake uncovered for 40 minutes, until the center is set and does not look liquid when the dish is gently nudged. Check the center with a food thermometer; USDA FSIS recommends that egg dishes reach 160°F (71°C). If the middle has not reached that temperature, continue baking in 5-minute increments and check again. If the cheese is browning faster than the center is setting, loosely cover the dish with foil for the remaining baking time.
Set the casserole on a heat-safe surface and let it rest for 10 minutes before cutting. The brief rest helps the eggs finish settling and makes neater portions. Scatter on extra chives if you like, then cut into eight squares and serve warm.

Tips

Start with dry potatoes. Excess moisture is a common reason an egg casserole turns watery or takes longer to set. Refrigerated shredded potatoes are convenient; if they feel damp, blot them before layering. Avoid putting frozen potatoes straight into the dish unless they have been thawed and drained, because ice and meltwater can make the center soggy.
Brown the turkey in an even layer. If the skillet is crowded, the meat steams and releases more liquid instead of browning. Use a wide skillet, or cook the turkey in two batches. Small crumbles also distribute more evenly through the casserole and make the finished slices easier to cut.
Use a thermometer rather than color alone. Ground turkey should reach 160°F (71°C) before it is mixed into the casserole, and the finished egg dish should reach 160°F (71°C) at its center. Insert the thermometer into the middle without touching the baking dish. Oven times can vary with the pan, starting temperature of ingredients, and how densely the potatoes are packed.
Season in layers and avoid overfilling. Salt the turkey lightly, then taste it before adding the egg mixture. The cheddar contributes salt, so it is better to start with the listed amount and adjust at the table. Keep the ingredients within the dish size listed; a deeper, smaller pan changes the baking time and can leave the middle undercooked while the edges become firm.

Serving Suggestions

Serve each warm square with a simple side that adds freshness, such as sliced tomatoes, orange segments, or a bowl of berries. A lightly dressed green salad or crisp cucumber slices also balance the richness of the eggs and cheddar, especially for a brunch spread. For a more traditional breakfast plate, add toast, English muffins, or warm tortillas so diners can make a sandwich or wrap.

Set out salsa, hot sauce, or a little plain yogurt alongside the casserole rather than pouring sauce over the whole dish. That lets everyone choose their preferred level of heat and keeps leftover portions from becoming soggy. If serving a group, cut the casserole after its 10-minute rest and keep the pieces in the warm baking dish; do not leave cooked eggs sitting at room temperature for more than two hours.

Variations

For a milder, creamier flavor, replace half or all of the cheddar with Monterey Jack. Pepper Jack adds a gentle chile kick, while a little crumbled feta gives the casserole a saltier, tangier character. Because feta is salty, reduce the added salt slightly and taste the turkey before assembling. You can also swap the chives for 2 tablespoons (6 g) chopped parsley or 1 tablespoon (3 g) chopped oregano.

To add greens, stir 2 cups (60 g) baby spinach into the hot onion and pepper mixture until just wilted, then let excess liquid cook off before combining it with the turkey. Chopped cooked broccoli works too; use about 1 cup (150 g), and drain it well. For more vegetables, replace up to half of the bell pepper with 1 cup (100 g) sliced mushrooms, cooking them until their released moisture has evaporated.

If you do not have refrigerated shredded potatoes, use 20 ounces (567 g) thawed frozen shredded potatoes and press them dry. Diced cooked potatoes can also work, though their larger pieces make the casserole less cohesive and more like an egg bake with potato chunks. Ground chicken can replace the turkey in the same quantity; cook it to 160°F (71°C) as ground meat and keep the rest of the method the same. Avoid adding raw sausage or other uncooked meat without browning and checking it first.

Storage and Reheating

Let leftovers cool briefly, then refrigerate them in a covered container within 2 hours of baking. Keep the casserole refrigerated for 3 to 4 days. For convenient portions, cut it into squares before storing, placing parchment between stacked pieces if needed. The potatoes may soften slightly as they sit, but the flavor and texture remain suitable for reheating within that storage window.

Reheat an individual portion in the microwave, covered loosely, in 30-second bursts until steaming hot throughout. For a larger amount, cover the baking dish with foil and warm it in a 325°F (163°C) oven until the center reaches 165°F (74°C). USDA FSIS recommends reheating leftovers to 165°F (74°C); check with a food thermometer rather than relying only on a hot edge. If reheating a single slice in a skillet, use low heat and cover the pan so the center warms before the bottom gets too dark.

To freeze, cool the casserole, wrap individual portions airtight, and freeze for up to 2 months for best quality. Thaw portions in the refrigerator overnight before reheating, or reheat from frozen gently in a covered oven-safe dish, allowing extra time and checking that the center reaches 165°F (74°C). Do not thaw it on the counter. Freezing can make the potatoes and eggs a little softer, so frozen portions are especially useful for quick breakfasts rather than a presentation-style brunch.

Frequently Asked Questions

Can I assemble the casserole the night before?

Yes. Cook and cool the turkey mixture, then assemble the potatoes, turkey, egg mixture, and cheese in the greased baking dish. Cover and refrigerate promptly overnight, and bake the next morning. Since the chilled dish may need a few extra minutes, begin checking at 40 minutes and use a thermometer to confirm that the egg center reaches 160°F (71°C). Do not leave the assembled casserole at room temperature while you wait for the oven to heat.

Why is the middle of my breakfast casserole still runny?

The most common causes are wet potatoes, a deep baking dish, or removing the casserole before the center reaches a safe temperature. Press moisture from the potatoes, use the specified 9-by-13-inch dish, and check the middle with a thermometer. If the top is already browned, cover it loosely with foil and continue baking in short intervals. Let it rest for 10 minutes after baking; resting helps it slice, but it does not replace reaching 160°F (71°C).

Can I use a different kind of milk?

Yes. Unsweetened, unflavored dairy-free milk can replace the whole milk in the same amount, although the casserole may be a little less rich. Avoid sweetened or vanilla-flavored varieties, which can give the eggs an unexpected taste. Two-percent milk also works. Cream is not necessary here; it makes a richer mixture and can make the finished casserole feel heavier.

Can I make this without cheese?

Yes. Leave out the cheddar and continue with the same egg mixture and baking method. The casserole will be less savory and may feel slightly less rich, but it will still set. Season the turkey mixture carefully, and consider adding extra chives, parsley, or a spoonful of salsa when serving. Check the center temperature just as you would in the cheese version.

How can I tell when it is done if I do not have a thermometer?

A set center with no visible liquid egg is a useful visual cue, but a thermometer is the reliable way to confirm safety. Egg dishes should reach 160°F (71°C), and the center can lag behind the edges. If you cook egg casseroles often, an inexpensive instant-read thermometer helps avoid both undercooking and baking so long that the eggs turn rubbery.

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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

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