American Breakfast

Cheesy Poblano Breakfast Casserole

A hearty, smoky, and cheesy breakfast bake packed with roasted poblano peppers that will have everyone gathered around the table.

Imagine pulling a bubbling, golden-topped casserole out of the oven on a lazy weekend morning. The aroma of roasted poblano peppers mingles with melted cheese and savory sausage, filling your kitchen with the kind of warmth that makes you want to linger over your coffee a little longer. This Cheesy Poblano Breakfast Casserole is everything you love about a big, satisfying breakfast, all baked together in one beautiful dish.

This recipe is perfect for weekend brunches, holiday mornings, or any time you need to feed a hungry crowd without spending the whole morning at the stove. Because you can assemble it the night before and simply pop it in the oven the next day, it is a lifesaver for Christmas morning, Easter brunch, or any overnight guests who deserve a proper breakfast. The mild heat from the poblanos adds just enough depth and character without overwhelming anyone at the table.

I first made this casserole for a family brunch when I needed something that felt a little more special than scrambled eggs but still totally approachable. One bite of that smoky pepper, creamy egg custard, and gooey melted cheese combination, and it immediately became a permanent part of my breakfast rotation. Whether you are cooking for two or twelve, this dish delivers every single time.

Recipe at a Glance

⏱Prep Time20 mins

🔥Cook Time50 mins

🕐Total Time1 hr 10 mins

🍰Servings8 servings

🇺🇸CuisineAmerican

🔢Calories~390 per serving

Ingredients

Peppers and Vegetables

3 large poblano peppers

1 medium yellow onion, diced

1 red bell pepper, diced

2 cloves garlic, minced

1 tablespoon olive oil

Protein

1 pound breakfast sausage, casings removed

1/2 teaspoon smoked paprika

Egg Custard

10 large eggs

1 cup whole milk

1/2 cup sour cream

1 teaspoon salt

1/2 teaspoon black pepper

1/2 teaspoon garlic powder

1/4 teaspoon cumin

Base and Cheese

4 cups cubed day-old bread, such as sourdough or French bread (about 1-inch cubes)

1 1/2 cups shredded Monterey Jack cheese, divided

1 cup shredded sharp cheddar cheese, divided

2 tablespoons chopped fresh cilantro, for garnish

Substitutions & Variations

★If you cannot find poblano peppers, Anaheim peppers or even mild Hatch green chiles make a great swap with a similar smoky flavor.

★Turkey or chicken breakfast sausage works perfectly in place of pork sausage for a lighter version of this casserole.

★Swap the sourdough or French bread for a gluten-free loaf to make this dish gluten-free without sacrificing any of the texture.

★Sour cream can be replaced with plain full-fat Greek yogurt in the egg custard for a slightly tangier and higher-protein result.

★For a vegetarian version, skip the sausage and add one cup of drained and rinsed black beans plus a handful of sliced mushrooms sauteed with the onions.

Step-by-Step Instructions

1

Roast the Poblano Peppers

Preheat your broiler to high. Place the whole poblano peppers on a foil-lined baking sheet and broil them about 4 to 5 inches from the heat, turning every 3 to 4 minutes, until the skins are charred and blistered all over, about 12 to 15 minutes total. Transfer the peppers to a bowl, cover tightly with plastic wrap, and let them steam for 10 minutes. This makes the skins easy to slip off. Once cooled, peel away the charred skins, remove the stems and seeds, and roughly chop the peppers into bite-sized pieces. Set aside.

2

Preheat the Oven

Preheat your oven to 350 degrees Fahrenheit. Grease a 9x13-inch baking dish generously with butter or nonstick cooking spray and set it aside. This ensures the casserole releases cleanly and develops those irresistible golden edges.

3

Cook the Sausage

Heat a large skillet over medium-high heat. Add the breakfast sausage and sprinkle in the smoked paprika. Cook, breaking the sausage into small crumbles with a wooden spoon, until fully browned and cooked through, about 7 to 8 minutes. Use a slotted spoon to transfer the cooked sausage to a paper towel-lined plate to drain the excess grease. Leave about one tablespoon of drippings in the pan.

4

Saute the Vegetables

Return the skillet to medium heat and add the olive oil. Add the diced onion and red bell pepper and cook, stirring occasionally, until softened and lightly golden, about 5 to 6 minutes. Stir in the minced garlic and cook for 1 more minute until fragrant. Remove the pan from the heat and let the vegetable mixture cool slightly.

5

Whisk the Egg Custard

In a large mixing bowl, crack in the 10 eggs. Add the whole milk, sour cream, salt, black pepper, garlic powder, and cumin. Whisk everything together vigorously until the mixture is completely smooth and well combined with no streaks of sour cream remaining. A silky, uniform custard is the secret to a casserole that sets up creamy rather than rubbery.

6

Layer the Casserole

Scatter the cubed bread evenly across the bottom of the prepared baking dish. Spread the cooked sausage crumbles over the bread layer, followed by the sauteed vegetables and the chopped roasted poblanos. Sprinkle 1 cup of the Monterey Jack and 3/4 cup of the cheddar evenly over the top of the filling, reserving the rest for finishing.

7

Add the Egg Mixture

Pour the whisked egg custard slowly and evenly over the entire casserole, making sure every bit of bread gets saturated. Use the back of a spoon to gently press down on any bread cubes that are poking up above the liquid. This step is important for even cooking and a cohesive texture throughout the finished dish.

8

Rest Before Baking (Optional but Recommended)

If time allows, cover the casserole tightly with plastic wrap and refrigerate for at least 30 minutes, or overnight if you are preparing it the day before. This resting period lets the bread fully absorb the egg custard, resulting in a much richer and creamier texture after baking. If you are baking right away, let it sit at room temperature for at least 10 minutes before going into the oven.

9

Bake Covered

Remove the plastic wrap and cover the baking dish tightly with aluminum foil. Bake in the preheated 350-degree oven for 30 minutes. Covering the casserole during the first part of baking traps steam and ensures the center cooks through gently without the top burning before the eggs are set.

10

Finish Baking Uncovered

Remove the foil and scatter the remaining Monterey Jack and cheddar cheese over the top. Continue baking uncovered for another 18 to 22 minutes, until the cheese is melted and golden brown in spots and the center of the casserole is fully set. You can test doneness by inserting a knife in the center and making sure it comes out clean with no liquid egg running out.

11

Rest and Garnish

Remove the casserole from the oven and let it rest for at least 10 minutes before slicing and serving. This resting time allows the egg custard to firm up slightly, making it much easier to cut clean, beautiful portions. Scatter the fresh chopped cilantro over the top just before serving for a pop of color and fresh flavor.

Pro Baker Tips

✓Day-old or slightly stale bread works best here because it absorbs the egg custard without becoming mushy. Fresh bread can make the texture a bit too soft.

✓Roasting the poblanos yourself gives the best smoky flavor, but in a pinch you can use a 4-ounce can of diced green chiles as a quick substitute.

✓Do not skip pressing the bread cubes into the custard after pouring it over. This small step makes a big difference in the final texture.

✓If you want the casserole to have a little more heat, leave some of the poblano seeds in or stir in a pinch of red pepper flakes into the egg custard.

✓Let the casserole come to room temperature for about 20 minutes after taking it out of the fridge before baking to promote more even cooking.

Storage & Serving Notes

◆Store any leftover casserole tightly covered in the refrigerator for up to 4 days. The flavors actually deepen as it sits, making leftovers just as good the next morning.

◆To reheat individual portions, microwave on medium power for 90 seconds to 2 minutes until warmed through, covering loosely with a damp paper towel to keep it from drying out.

◆To reheat a larger portion, cover with foil and warm in a 325-degree oven for about 15 to 20 minutes until heated through.

◆This casserole freezes well. Cut it into individual portions, wrap each one tightly in plastic wrap and then foil, and freeze for up to 2 months. Thaw overnight in the refrigerator before reheating.

Serving Suggestions

This casserole is a complete meal on its own, but a few simple sides and toppings make it feel like a true brunch spread.

›Serve with a dollop of sour cream and a drizzle of your favorite hot sauce on top

›Pair with fresh sliced avocado or a scoop of chunky guacamole on the side

›A light fruit salad with berries and citrus balances the richness of the casserole beautifully

›Warm flour tortillas on the side let guests wrap up bites into a little breakfast burrito style

›Offer a pitcher of fresh-squeezed orange juice or a big pot of hot coffee to complete the brunch experience

Frequently Asked Questions

Can I make this casserole the night before?

Absolutely, and it is actually encouraged. Assembling the casserole the night before and letting it rest overnight in the refrigerator gives the bread time to fully absorb the egg custard, resulting in a creamier, more cohesive texture when baked. Just take it out of the fridge about 20 minutes before baking so it is not ice cold going into the oven.

Are poblano peppers very spicy?

Poblano peppers are one of the milder chili peppers, typically registering between 1,000 and 2,000 Scoville heat units. They have a gentle warmth and a rich, slightly smoky flavor rather than an intense burn, making this casserole family-friendly and approachable even for those who are sensitive to spicy food.

Can I make this recipe without meat?

Yes, it works wonderfully as a vegetarian dish. Simply skip the sausage and add extra vegetables in its place. Sauteed mushrooms, black beans, corn kernels, or even diced zucchini are all great options that keep the casserole hearty and satisfying without any meat.

What type of bread works best for this casserole?

Sturdy, slightly stale breads like sourdough, French bread, or Italian bread work best because they hold up to the egg custard without turning to mush. Avoid super soft sandwich bread as it tends to break down too much during the long soak and bake time.

How do I know when the casserole is fully cooked?

The casserole is done when the top is golden brown, the cheese is bubbly, and the center no longer jiggles when you gently shake the pan. You can also insert a thin knife or toothpick into the very center of the dish and it should come out clean with no liquid egg clinging to it.

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Go Make It!

This Cheesy Poblano Breakfast Casserole is the kind of recipe that turns an ordinary morning into something worth remembering. It is smoky, cheesy, satisfying, and so much easier to pull together than it looks. Whether you are hosting a big holiday brunch, feeding a houseful of overnight guests, or just treating your family to a special weekend breakfast, this dish is guaranteed to impress. Give it a try this weekend, and do not be surprised when everyone asks you for the recipe before they even finish their first serving.