Jalapeño Popper Breakfast Casserole with Bacon and Eggs

This jalapeño popper breakfast casserole brings together eggs, crisp bacon, jalapeños, cream cheese, and cheddar in a savory bread bake. It borrows the creamy, cheesy, gently spicy flavors of jalapeño poppers and turns them into a filling brunch dish that can be assembled in one baking dish.

Ingredients

1 tablespoon (14 g) unsalted butter, for greasing the baking dish
8 cups (about 280 g) cubed day-old sandwich bread, preferably sturdy white or sourdough bread
8 ounces (225 g) bacon, cut into small pieces
2 medium jalapeños (about 30 g total), finely chopped; remove seeds and ribs for less heat
8 ounces (225 g) cream cheese, softened and cut into small cubes
2 cups (200 g) shredded sharp cheddar cheese, divided
8 large eggs
2 cups (480 ml) whole milk
1 teaspoon (5 g) Dijon mustard
½ teaspoon (about 1.5 g) garlic powder
½ teaspoon (3 g) kosher salt, or less if the bacon is especially salty
¼ teaspoon (about 0.5 g) freshly ground black pepper
2 scallions (about 30 g), thinly sliced, for topping

Instructions

Prepare the dish and oven. Heat the oven to 350°F (177°C). Butter a 9-by-13-inch (23-by-33-cm) baking dish. If the bread is fresh and soft rather than day-old, spread the cubes on a sheet pan and toast them in the heating oven for 8 to 10 minutes, just until the surfaces feel dry. Let them cool while you prepare the other ingredients; dry bread absorbs the egg mixture more evenly.
Cook the bacon. Put the bacon in a large skillet over medium heat. Cook for 8 to 10 minutes, stirring now and then, until browned and crisp. Transfer it to a paper-towel-lined plate, leaving behind most of the rendered fat. Once cool enough to handle, chop any larger pieces. If the skillet has more than a thin coating of fat, carefully pour off the excess.
Layer the filling. Scatter the bread cubes evenly in the prepared dish. Sprinkle over the bacon and chopped jalapeños. Dot the top with the cream cheese cubes, distributing them across the whole dish rather than gathering them in the center. Sprinkle on 1½ cups (150 g) of the cheddar; save the remaining ½ cup (50 g) for the top.
Mix and pour the custard. In a large bowl, whisk the eggs until the yolks and whites are blended. Whisk in the milk, Dijon mustard, garlic powder, salt, and black pepper. Pour the mixture slowly over the bread, aiming for the corners as well as the middle. Press the bread gently with the back of a spoon so the top layer makes contact with the custard. Let the assembled casserole stand for 10 minutes to start absorbing the liquid.
Bake until set. Sprinkle the reserved cheddar over the top. Bake uncovered for about 50 minutes, until the edges are golden and the center is set rather than liquid. Check the center with a food thermometer; egg dishes should reach the USDA FSIS safe minimum internal temperature of 160°F (71°C). If the top browns before the middle reaches temperature, loosely tent the dish with foil and continue baking, checking again after 5 minutes.
Rest and finish. Let the casserole rest for 10 minutes so the custard can settle and the portions hold together more neatly. Scatter the sliced scallions over the top, then cut into eight portions and serve warm.

Tips

Choose bread that can hold its shape. Day-old sandwich bread, sourdough, or a sturdy country loaf works better than very soft, thin-sliced bread, which can become mushy. If you only have fresh bread, briefly toast the cubes as directed. Cut them to roughly 1-inch (2.5-cm) pieces so each serving has a good balance of bread and filling.
Control the jalapeño heat. The seeds and pale ribs inside the peppers carry much of their heat, so scrape them out for a milder casserole. For more spice, leave some ribs in or use three peppers. Wear kitchen gloves if you are sensitive to hot peppers, and wash your hands and knife after chopping.
Soften the cream cheese before cubing. Softened cream cheese is easier to distribute in small pieces and bakes into creamy pockets. If it is cold, cut it into cubes and let it sit at room temperature while you prep the remaining ingredients. Avoid trying to whisk it into the cold egg mixture; small lumps are expected in the casserole, but large clumps of cream cheese are difficult to spread evenly.
Season thoughtfully. Bacon and cheddar both bring salt, so the modest amount listed is a starting point. If using low-sodium bacon or mild cheese, you can season the egg mixture a little more. Taste the cooked bacon before adding extra salt, and do not skip the thermometer check just because the edges look done.

Serving Suggestions

Serve the casserole warm as the main dish for breakfast or brunch. A crisp green salad with a simple vinaigrette, sliced tomatoes, or fresh fruit balances the richness of the eggs, bacon, and cheese without adding much work. For a larger brunch spread, pair it with roasted breakfast potatoes, a bowl of berries, or a platter of toast and jam.

Offer toppings at the table so everyone can finish a portion to taste. Thinly sliced scallions add freshness, while a spoonful of salsa or pico de gallo brings a bright, juicy contrast. Sour cream or plain Greek-style yogurt can cool the jalapeño heat; keep any dairy topping separate rather than spreading it over the whole casserole. If serving a crowd, cut the bake into eight substantial portions or smaller squares alongside other dishes.

Variations

Make it meatless: Leave out the bacon and add 1 cup (about 100 g) of sliced sautéed mushrooms or ¾ cup (about 120 g) of drained, chopped roasted red peppers. The mushrooms make the filling more savory, while roasted peppers give it a sweeter, milder flavor. Cook mushrooms until their released liquid has evaporated so they do not water down the custard.

Use a different cheese: Replace some or all of the cheddar with Monterey Jack for a milder, softer melt, or use pepper jack for extra pepper flavor. A little smoked gouda can add a smoky note, but keep the total shredded cheese close to 2 cups (200 g) so the casserole remains balanced rather than greasy.

Try a sausage version: Substitute 8 ounces (225 g) of breakfast sausage for the bacon. Brown it thoroughly in a skillet, breaking it into small crumbles, and drain excess fat before layering. If using raw ground sausage, make sure it reaches 160°F (71°C) while cooking in the skillet before it goes into the casserole; the egg mixture still needs to reach 160°F (71°C) in the oven.

Make it without bread: For a lower-bread, more frittata-like bake, omit the bread and reduce the milk to 1 cup (240 ml). The result will be denser and more egg-forward, with less of the soft, custardy texture that bread gives this casserole. Keep the remaining filling amounts the same, and begin checking for doneness around 35 minutes because the thinner mixture may bake faster.

Storage and Reheating

For food safety, refrigerate the casserole within 2 hours of baking. Let it cool only until it is no longer steaming heavily, then cover the baking dish or transfer portions to shallow airtight containers. Refrigerated leftovers keep for 3 to 4 days. For easier reheating, cut the casserole into individual portions once cool; this also makes it simpler to take just what you need.

Reheat a portion in the microwave, covered loosely, in 30- to 60-second intervals until hot throughout. For a larger amount, cover the baking dish with foil and warm it in a 325°F (163°C) oven; the time depends on the portion size, so check the center with a food thermometer. USDA FSIS guidance is to reheat leftovers to 165°F (74°C). Uncover for the last few minutes if you want to refresh the browned top, but avoid prolonged heating, which can make the eggs firm and dry.

You can freeze fully baked, cooled portions in freezer-safe containers for up to 2 months for best texture. Thaw them in the refrigerator before reheating, rather than leaving them on the counter. The bread may soften slightly after freezing, but the flavor remains suitable for a quick breakfast. Do not freeze a whole casserole in a glass dish unless the dish is explicitly designed for freezer-to-oven use, since sudden temperature changes can cause glass to break.

Frequently Asked Questions

Can I assemble the casserole the night before?

Yes. Assemble the layers and pour the egg mixture over the bread, then cover the dish and refrigerate it overnight. For best texture, add the final ½ cup (50 g) of cheddar just before baking. The bread will absorb more custard during the longer rest, so the bake may need a few extra minutes; check that the center reaches 160°F (71°C) rather than relying on the clock alone. Do not leave the uncooked egg mixture at room temperature overnight.

Can I use milk other than whole milk?

Two-percent milk works well, although the custard will be a little less rich. Unsweetened, unflavored oat milk can also be used, but its flavor and texture may differ slightly from dairy milk. Avoid sweetened or vanilla-flavored milk, which would make the savory casserole taste out of place. Very low-fat milk can produce a less tender result, especially if the casserole is baked beyond the point that the center sets.

How do I know when the middle is cooked?

The center should look set and should not ripple like uncooked liquid when you gently move the dish. For a reliable food-safety check, insert an instant-read thermometer into the center without touching the bottom of the pan; egg dishes should reach 160°F (71°C). If the center is below temperature but the cheese is already dark, cover the casserole loosely with foil and continue baking in short increments.

Can I make it less spicy for children or guests?

Yes. Remove all the jalapeño seeds and ribs, use just one pepper, or replace the jalapeños with chopped mild green chiles. Canned green chiles are convenient; drain them well so they do not add excess liquid. You can also serve the casserole with hot sauce on the side, allowing guests who want more heat to add it to their own portions.

Why did my casserole turn out watery?

Common causes include using bread that is too soft, adding wet vegetables without draining or cooking them first, or taking the casserole out before the center has set. Use sturdy bread, cook watery additions such as mushrooms, and give the assembled dish its 10-minute soak before baking. If the center has reached the safe temperature but the casserole still seems soft, let it rest for the full 10 minutes; the custard firms as it settles.

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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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