Easy Brunch Casserole – Best 30-Minute Make-Ahead

Brunch is my favorite meal of the day – it's relaxed, social, and can be sweet or savory. This baked egg casserole is the ultimate brunch centerpiece: it's hearty, customizable, and comes together in a snap.

I started making this when I hosted my first brunch for friends. I wanted something that didn't chain me to the stove, so I could actually enjoy the coffee and conversation. This casserole became my go-to, and now it's a staple for holidays and lazy weekends alike.

The beauty is in the simplicity: whisk eggs, layer in your favorite fillings, and let the oven do the work. You can prep it the night before, pop it in the oven in the morning, and serve a warm, satisfying dish that pleases everyone.

About the Ingredients

8 large eggs

The base of the casserole. Use fresh eggs for best texture. Substitute with 2 cups liquid egg substitute if preferred.

1 cup (240ml) whole milk

Adds richness and creaminess. Use half-and-half for extra decadence, or milk alternative like oat milk.

1/2 cup (60g) all-purpose flour

Helps the casserole set and hold together. Gluten-free flour blend works too.

1 teaspoon baking powder

Gives a slight lift for a fluffier texture. Ensure it's fresh for best rise.

1/2 teaspoon salt

Enhances all the flavors. Adjust to taste if using salty add-ins.

1/4 teaspoon black pepper

Adds a subtle kick. Freshly ground is best.

1 cup (120g) shredded cheddar cheese

Melts beautifully and adds savory depth. Try pepper jack for heat or Swiss for nuttiness.

1 cup (150g) cooked breakfast sausage, crumbled

Use spicy or mild, or substitute with cooked bacon, ham, or plant-based sausage.

1/2 cup (75g) diced red bell pepper

Adds color and a slight sweetness. Substitute with any bell pepper or roasted red peppers.

1/4 cup (25g) chopped green onions

Fresh onion flavor and a pop of green. Chives or shallots also work.

Tips & Tricks

Don't overmix the batter

Stir just until combined to keep the casserole tender, not tough.

Grease the baking dish well

This prevents sticking and makes cleanup easy. Use butter or nonstick spray.

Let it rest after baking

Allow 5-10 minutes before slicing so it sets and holds its shape.

Step-by-Step Instructions

1. Preheat and Prep

Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking dish with butter or nonstick spray.

2. Whisk the Batter

In a large bowl, whisk together eggs, milk, flour, baking powder, salt, and pepper until smooth and no lumps remain. This creates a custard-like base.

3. Layer the Fillings

Spread sausage, bell pepper, and green onions evenly in the prepared dish. Sprinkle half the cheese on top.

4. Pour the Egg Mixture

Pour the egg mixture over the fillings, then sprinkle the remaining cheese on top. Gently shake the dish to settle.

5. Bake to Golden

Bake for 35-40 minutes, until the edges are golden brown and the center is set. A knife inserted near the center should come out clean, and the top should be puffed and lightly browned.

6. Rest and Serve

Let the casserole rest for 5-10 minutes before slicing. This allows it to firm up for clean slices. Serve warm.

Delicious Variations

Veggie Lover

Skip the meat and add sautéed mushrooms, spinach, and zucchini.

Southwest

Use pepper jack cheese, chorizo, and add a can of diced green chiles.

Herb & Goat Cheese

Swap cheddar for goat cheese and add fresh thyme and rosemary.

How to Store Brunch

Frequently Asked Questions

This brunch casserole is your ticket to a stress-free, delicious morning. Whip it up for your next gathering, and watch it disappear. Small steps, big impact.

Brunch

Brunch casserole with eggs, sausage, and cheese, baked to golden perfection. Perfect for feeding a crowd with minimal fuss.

★★★★½ 4.8 (156 ratings)

15 minPrep time40 minCook time6Servings320 kcalCalories

Print RecipePin Recipe

🧂 Ingredients

• 8 large eggs
• 1 cup (240ml) whole milk
• 1/2 cup (60g) all-purpose flour
• 1 teaspoon baking powder
• 1/2 teaspoon salt
• 1/4 teaspoon black pepper
• 1 cup (120g) shredded cheddar cheese
• 1 cup (150g) cooked breakfast sausage, crumbled
• 1/2 cup (75g) diced red bell pepper
• 1/4 cup (25g) chopped green onions

📋 Instructions

1. 1Preheat and Prep — Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking dish with butter or nonstick spray.
2. 2Whisk the Batter — In a large bowl, whisk together eggs, milk, flour, baking powder, salt, and pepper until smooth and no lumps remain. This creates a custard-like base.
3. 3Layer the Fillings — Spread sausage, bell pepper, and green onions evenly in the prepared dish. Sprinkle half the cheese on top.
4. 4Pour the Egg Mixture — Pour the egg mixture over the fillings, then sprinkle the remaining cheese on top. Gently shake the dish to settle.
5. 5Bake to Golden — Bake for 35-40 minutes, until the edges are golden brown and the center is set. A knife inserted near the center should come out clean, and the top should be puffed and lightly browned.
6. 6Rest and Serve — Let the casserole rest for 5-10 minutes before slicing. This allows it to firm up for clean slices. Serve warm.

👨‍🍳 Chef's Note: If you're using a glass baking dish, you may need to add 5-10 minutes to the baking time. Always let it rest before serving for the best texture.

Servings: 6

Cuisine: American

Course: Breakfast

Nutrition (per serving): 320 kcal · 18g protein · 12g carbs · 22g fat

Written by Maya Chen

Maya writes about sustainable living and zero-waste practices, focusing on small, actionable changes for everyday life. She shares practical tips from her own experiments in reducing plastic and food waste.