Ingredients
(9x13-inch baking dish; serves 8–10)
1 lb (450 g) breakfast sausage, browned and thoroughly drained
6 cups day-old bread, cut into 1-inch cubes
2 cups (225 g) sharp cheddar cheese, shredded
½ cup (60 g) diced green bell pepper
¼ cup (40 g) diced yellow onion
6 large eggs
2 cups (480 ml) whole milk
1 tsp salt
½ tsp black pepper
1 tsp dry mustard
2 tbsp unsalted butter, melted
Optional garnish: Fresh chives, hot sauce, or cracked black pepper
Step-by-Step Instructions
Prep & Preheat: Set your oven to 350°F (175°C). Lightly grease a 9x13-inch baking dish with butter or cooking spray.
Layer the Base: Spread the cubed bread evenly across the bottom of the prepared dish. Sprinkle the browned sausage, diced bell pepper, onion, and shredded cheddar cheese evenly over the bread.
Make the Custard: In a large mixing bowl, whisk together the eggs, whole milk, salt, black pepper, and dry mustard until completely smooth and slightly frothy.
Assemble & Soak: Pour the egg mixture evenly over the layered bread and toppings. Gently press down with a spatula or the back of a spoon to ensure the bread is fully submerged and begins absorbing the custard.
Rest & Butter: Let the casserole rest at room temperature for 10 minutes. This allows the bread to fully hydrate and prevents dry pockets. Drizzle the melted butter evenly over the top.
Bake to Perfection: Place in the oven and bake for 35–40 minutes, or until the center is firmly set, the edges are lightly pulling away from the pan, and the top is deeply golden brown.
Cool & Serve: Remove from the oven and let it rest for 5 minutes before slicing. This crucial step allows the custard to set cleanly for beautiful, cohesive portions.
Serving Suggestions
Derby Day Classic: Pair with fresh fruit salad, warm buttermilk biscuits, or a cool mint julep
Lighter Balance: Serve alongside sliced heirloom tomatoes, avocado, or a simple arugula salad with lemon vinaigrette
Condiment Bar: Offer hot sauce, pure maple syrup, sour cream, or salsa for customizable flavor at the table
Brunch Spread: Complement with roasted breakfast potatoes, crispy bacon, or cinnamon rolls for a full morning feast
You Must Know
Day-old bread is essential: Fresh, soft bread turns mushy and collapses under the custard. Stale or lightly toasted cubes absorb the liquid while maintaining structure.
Drain the sausage thoroughly: Excess grease will pool in the dish, making the casserole heavy and oily. Blot with paper towels after browning.
Dry mustard is the secret weapon: It doesn’t taste like mustard; it acts as a flavor enhancer, emulsifier, and subtle tang that makes the cheese and eggs sing. Don’t skip it.
Press gently but thoroughly: Ensures every cube makes contact with the custard so the final bake is uniformly moist.
Make-ahead magic: Assemble completely, cover tightly, and refrigerate overnight. Add 5–10 minutes to the bake time since you’ll be starting from cold.
Storage Tips
Refrigerator: Cool completely, cover tightly, and store for up to 3–4 days.
Reheating: Warm individual portions in the microwave in 30-second intervals, or reheat the whole dish covered with foil at 325°F (160°C) for 15–20 minutes. Add a splash of milk if it feels dry.
Freezing (Baked): Not ideal. The egg custard can become rubbery and the bread mushy upon thawing.
Freezing (Unbaked): Assemble the casserole, wrap tightly in foil and plastic, and freeze for up to 1 month. Thaw completely in the fridge overnight before baking as directed.
Frequently Asked Questions
Can I use a different type of bread?
Yes. Brioche, challah, sourdough, or French bread work beautifully. Avoid ultra-soft sandwich bread, which lacks the structure to hold up during baking.
Can I swap the breakfast sausage?
Absolutely. Browned bacon, diced ham, turkey sausage, or plant-based crumbles all work well. If using leaner meats, add 1 tablespoon of olive oil to the custard to maintain richness.
Why dry mustard instead of prepared mustard?
Dry mustard dissolves completely into the custard, delivering consistent flavor without adding extra moisture or vinegar that could curdle the eggs.
How do I know when it’s fully cooked?
The center should barely jiggle when the pan is gently shaken, and a knife inserted into the middle should come out clean. For precision, an instant-read thermometer should read 160°F (71°C).
Can I make this lighter?
Yes. Substitute whole milk with 2% or a 50/50 blend of milk and low-sodium chicken broth. Reduce the cheese by ¼ cup. Note that the texture will be slightly less rich and custardy.
Allergy Information
Contains: Gluten/Wheat (bread), Dairy (milk, cheese, butter), Eggs, Pork (sausage)
Gluten-Free Swap: Use certified gluten-free bread or cubed GF cornbread
Dairy-Free Swap: Replace milk with unsweetened plant milk, use vegan cheddar, and substitute butter with dairy-free baking sticks. Texture will be slightly lighter
Cross-Contact Warning: Always verify packaging labels on bread, sausage, and cheese, as shared manufacturing facilities often process soy, nuts, or wheat
Dietary Note: Naturally nut-free and soy-free as written, but verify sausage ingredients if strict avoidance is required
The Kentucky Derby Casserole is a masterclass in effortless hospitality. With just a handful of pantry staples and the quiet magic of overnight soaking, you create a dish that’s deeply savory, perfectly textured, and ready to shine at any morning gathering. It’s a recipe that honors tradition while fitting seamlessly into modern, busy schedules—proving that the best brunches aren’t built on stress, but on simplicity, foresight, and shared warmth. Layer, rest, bake, and gather around the table. Sometimes, the most memorable meals are the ones that practically prepare themselves
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