# Make-Ahead Breakfast Casserole with Sausage, Eggs and Cheddar > A classic make-ahead breakfast casserole layered with savory breakfast sausage, fluffy eggs and sharp cheddar — perfect for busy mornings or a relaxed brunch. Assemble the night before, bake the next morning, and enjoy a crowd-pleasing hot breakfast with minimal hands-on time. Canonical URL: https://www.topshelf.recipes/recipes/make-ahead-breakfast-casserole-sausage-eggs-cheddar ## Author Jake Woods https://www.topshelf.recipes/chef/jake-woods Published: June 26, 2026 Last Updated: September 28, 2026 ## About This Recipe This make-ahead breakfast casserole is the sort of recipe that quietly saves weekends: savory breakfast sausage, a rich egg custard and sharp cheddar built on day-old bread deliver a mix of textures — crisped edges, a tender, custardy interior and pockets of melty cheese. It’s deliberately straightforward, leaning on a reliable ratio of eggs to milk so the custard sets without becoming rubbery, and on the bold flavor of breakfast sausage to season the whole dish without a lot of extra herbs or fuss. Using day-old bread and gently pressing the cubes helps the custard soak evenly, while a scatter of sharp cheddar on top creates that irresistible browned cheese crust. This casserole is made for both busy mornings and relaxed brunches: assemble the night before, bake in the morning, and you’ll have hot, sliceable portions ready to feed a crowd. The formula is forgiving, so you can swap breads, cheeses or add-ins without wrecking the structure, and leftovers reheat well for several days. If you want something that performs — portable, crowd-pleasing and very forgiving — this version balances convenience and texture in a way that many make-aheads don’t. ## Recipe Information - Prep Time: 25 minutes - Cook Time: 45 minutes - Total Time: 70 minutes - Servings: 4 - Difficulty: Easy - Category: Breakfast ## Ingredients ### Cook the sausage and onion - 1 lb ground breakfast sausage - 1 cup yellow onion, diced ### Prepare the baking dish and bread - 1 tbsp unsalted butter (for greasing) - 6 cups day-old bread, cut into 1-inch cubes (white or sourdough) ### Whisk the egg custard - 8 large large eggs - 2 cups whole milk - 1 tsp kosher salt - 3/4 tsp freshly ground black pepper ### Assemble the casserole - 2 cups sharp cheddar, shredded ## Instructions ### 1. Cook the sausage and onion Heat a large skillet over medium heat and add the ground breakfast sausage. Break the meat into crumbles and cook until mostly browned, then add the diced onion and continue to cook until the sausage is fully cooked and the onion is softened and translucent, about 6–8 minutes. Drain any excess fat, then transfer the mixture to a bowl and set aside to cool slightly. ### 2. Prepare the baking dish and bread Preheat the oven to 350°F (175°C) if baking immediately; if making ahead, skip preheating and refrigerate assembled casserole. Grease a 9x13-inch (23x33 cm) baking dish with the butter, then spread the cubed day-old bread in an even layer across the dish. Gently press the bread so pieces nestle together but still leave some air pockets for the custard to soak in. ### 3. Whisk the egg custard In a large bowl, whisk together the eggs, whole milk, kosher salt and black pepper until smooth and slightly frothy. Let the mixture sit for a minute so bubbles subside; this ensures an even custard that soaks into the bread. ### 4. Assemble the casserole Scatter half of the shredded cheddar over the bread, then spread the cooked sausage and onion evenly on top. Pour the egg mixture slowly over the layers, pressing the bread down gently with a spatula so the custard is absorbed. Sprinkle the remaining cheddar evenly across the surface. ### 5. Chill (make-ahead) or bake For make-ahead: cover tightly with plastic wrap and refrigerate for at least 6 hours or up to 24 hours to allow flavors to meld and the custard to fully soak the bread. To bake immediately or after chilling: remove plastic, let sit at room temperature 15 minutes, then bake uncovered at 350°F (175°C) for 40–45 minutes until the center is set and the top is golden brown. A knife inserted in the center should come out mostly clean. ### 6. Rest and serve Allow the casserole to rest 10 minutes before slicing; this helps it set and makes cleaner portions. Serve warm, garnished with chopped fresh herbs or sliced green onions if desired; leftovers keep 3–4 days refrigerated and reheat well. ## Nutrition Estimated nutrition per serving (1 serving): - Calories: 985 kcal - Protein: 56.4 g - Carbohydrates: 49.1 g - Fat: 61.5 g - Saturated Fat: 27.2 g - Fiber: 2.8 g - Sugar: 12.9 g - Cholesterol: 532.7 mg - Sodium: 2227.6 mg - Potassium: 859.1 mg - Calcium: 715.6 mg - Iron: 6.6 mg - Vitamin D: 5.2 mcg ## Tips ### Use day-old bread Stale bread soaks up the custard without turning to mush; if your bread is fresh, toast the cubes briefly to dry them out. ### Drain excess fat After browning the sausage and onion, drain off most of the fat to avoid a greasy, soggy casserole. ### Don’t over-whisk eggs Whisk the eggs just until combined — over-incorporating air can make the custard spongy instead of silky. ### Press, don’t pack Gently press the bread so it nests together but leaves air pockets; packing too tightly prevents even custard distribution. ### Bring to room temperature If chilled overnight, let the casserole sit 15 minutes before baking so it warms through and cooks evenly. ## Variations and Substitutions ### Vegetarian swap Replace the sausage with a mix of sautéed mushrooms, diced bell pepper and crumbled firm tofu or a plant-based sausage for a vegetarian-friendly casserole. ### Make it luxe Use half-and-half or heavy cream in place of whole milk and swap sharp cheddar for Gruyère to get a richer, more custardy texture and a nutty finish. ### Lower-fat option Choose turkey sausage, use 2% milk and reduce the cheese by half to cut calories and fat while keeping the same basic flavors. ### Veg-forward version Fold in a cup of sautéed spinach or kale and another cup of roasted vegetables (zucchini or sweet potato) for added color and nutrients. ## Notes This casserole shines for weekend brunches, holiday mornings, or any time you want a hearty, make-ahead breakfast. Home cooks will love how it holds well in the fridge overnight and slices cleanly for serving. ### Storage and Make-Ahead Store cooled leftovers in an airtight container in the refrigerator for 3–4 days. To freeze, slice into portions, wrap tightly and freeze for up to 2 months; thaw overnight in the fridge before reheating. Reheat individual slices in a 350°F oven for 10–15 minutes until warmed through, or microwave on medium power for 60–90 seconds, finishing in a hot oven if you want to recrisp the top. ### Serving Suggestions Serve slices with a bright accompaniment like a simple arugula salad dressed with lemon and olive oil or a bowl of mixed fresh fruit to cut the richness. For brunch, offer hot sauce, grainy mustard or pickled vegetables alongside, and pair with coffee, a citrusy mimosa or a Bloody Mary for a savory contrast. ## Frequently Asked Questions ### Can I assemble this casserole the night before? Yes — assembling and refrigerating for 6–24 hours improves flavor and ensures the custard fully soaks the bread; let it sit 15 minutes at room temperature before baking for even cooking. ### How do I prevent a soggy bottom? Use day-old or toasted bread cubes, drain excess sausage fat, and avoid over-pouring the custard; also make sure the dish bakes long enough so the center sets and excess moisture evaporates. ### Can I freeze the casserole before baking? You can freeze it assembled, but for best texture freeze after baking; if freezing raw, wrap tightly and thaw overnight before baking and expect a slightly wetter texture. ### What indicates the casserole is done? The center should be set and no longer jiggle — a knife inserted in the middle should come out mostly clean; the internal temperature will be around 160°F when fully set. ### Can I use a milk alternative? Yes, use a full-fat non-dairy milk like oat or cashew for similar richness; very thin plant milks may yield a looser custard, so reduce the amount slightly if needed. ## Related Recipes and Guides - [Pumpkin Oat Muffins](https://www.topshelf.recipes/recipes/pumpkin-oat-muffins) - [Chocolate Chip Banana Muffins](https://www.topshelf.recipes/recipes/brown-butter-chocolate-chip-banana-muffins) - [Pad Krapow Pork](https://www.topshelf.recipes/recipes/pad-krapow-pork) - [Canning Peaches Light Syrup](https://www.topshelf.recipes/recipes/canning-peaches-light-syrup) - [Easy Homemade Yogurt Without Special Equipment](https://www.topshelf.recipes/recipes/easy-homemade-yogurt-without-special-equipment) - [Maple Bacon Butter Board with Cracked Pepper and Toastables](https://www.topshelf.recipes/recipes/maple-bacon-butter-board-cracked-pepper-toastables) - [Last Backyard BBQs Made Easy](https://www.topshelf.recipes/articles/end-of-summer-make-ahead-cookouts-portable-recipes-host-hacks) - [Preserve the Season: Batch, Freeze, and Grill — Turn Seasonal Recipes into Make‑Ahead, Freezer‑Friendly Meals](https://www.topshelf.recipes/articles/preserve-the-season-batch-freeze-and-grill) - [Gluten-Free Weeknight Grilling Plan](https://www.topshelf.recipes/articles/gluten-free-weeknight-grilling-plan)