This cinnamon breakfast casserole is the answer to an easy, comforting breakfast for a crowd. Made with one loaf of French bread or brioche, an egg-and-milk custard, and buttery cinnamon streusel, it serves 8–10 people and bakes in a 9 x 13-inch dish at 350°F.
The texture is soft and custardy inside with crisp, crumbly topping on every serving. Prepare it in about 15–20 minutes, refrigerate it for at least 30 minutes or overnight, then bake it for 45–55 minutes for a warm breakfast everyone will love.
Jump to RecipeWhy You’ll Love This Recipe
This casserole brings the familiar flavor of cinnamon French toast to the table in one generous baking dish. Instead of standing over a skillet and cooking individual slices, you assemble everything ahead, chill it, and bake it when breakfast is ready.
Every bite has a lovely contrast: tender bread soaked with vanilla custard, fragrant cinnamon and nutmeg throughout, and a crisp brown sugar streusel on top. The recipe is sweet enough to feel special while still pairing beautifully with fresh berries, sliced bananas, or a savory breakfast side.
It is also a useful recipe for weekends, holiday mornings, brunch gatherings, and overnight guests. For another breakfast centerpiece with a different flavor profile, you can also try a blueberry casserole when berries are calling.
Ingredients You’ll Need
The bread is the foundation, so choose a sturdy French loaf or brioche weighing about 16 ounces. Day-old or slightly stale bread is ideal because it absorbs the custard without breaking down as quickly as very fresh bread.
- Bread: One loaf of French bread or brioche, cut into 1-inch cubes.
- Custard: Eight large eggs, 2 cups whole milk, 1/2 cup heavy cream or half-and-half, 3/4 cup granulated sugar, vanilla, cinnamon, nutmeg, and salt.
- Streusel: Light brown sugar, all-purpose flour, cinnamon, salt, and 6 tablespoons cold unsalted butter.
- Pan butter: One tablespoon to coat the 9 x 13-inch baking dish.
Whole milk gives the casserole a balanced, creamy texture, while the small amount of cream adds richness. The nutmeg is subtle, but it rounds out the cinnamon and gives the custard that classic French toast character.
How to Make It Step-by-Step
Step 1: Butter a 9 x 13-inch baking dish thoroughly, paying attention to the corners, then scatter the 1-inch bread cubes evenly across the bottom. A fairly even layer helps each piece receive a good amount of custard and makes serving easier.
Step 2: In a large bowl, whisk together the eggs, whole milk, heavy cream or half-and-half, granulated sugar, vanilla extract, cinnamon, nutmeg, and salt. Keep whisking until the eggs are fully blended and the spices are distributed rather than sitting in small clumps.
Step 3: Pour the custard slowly over the bread, moving around the dish so the liquid reaches all areas. Press the bread down gently with a spatula or clean fingertips, giving the cubes a chance to absorb the mixture without crushing them.
Step 4: Cover the dish and refrigerate for at least 30 minutes. Overnight chilling is preferred because it allows the custard to soak deeply into the bread and makes the morning preparation especially convenient.
Step 5: Make the streusel while the casserole chills by combining the brown sugar, flour, cinnamon, and salt in a bowl. Add the cold butter pieces and cut them in with a pastry cutter or your fingertips until coarse crumbs form, then refrigerate the topping if it becomes soft.
Step 6: Heat the oven to 350°F (175°C), remove the cover, and sprinkle the streusel evenly over the soaked bread. Try to reach the edges as well as the center so every portion has a buttery cinnamon topping.
Step 7: Cover the casserole with foil and bake for about 30 minutes. Remove the foil and continue baking for another 15–25 minutes, until the casserole is puffed, golden brown, and set in the center.
Step 8: Let the casserole rest for 5–10 minutes before cutting into it. Serve warm with maple syrup, powdered sugar, or fresh fruit, and use a sharp serving knife or spatula to lift out neat portions.
Pro Tips for the Best Casserole
Use bread that is slightly dry to the touch. If your loaf is very fresh, cut it into cubes and let it sit uncovered for a little while before assembling, since drier bread has more capacity to take in the custard while retaining its shape.
Pressing the bread gently after adding the custard is important, but avoid packing the cubes down tightly. Loose cubes allow the liquid to circulate and help the finished casserole remain tender rather than dense.
Cold butter makes the best streusel crumbs. Work quickly and stop when the mixture resembles coarse crumbs; if the butter melts completely, the topping can spread instead of forming a craggy, crisp layer.
Watch the center during the final baking stage. The casserole should be moist but set, and an instant-read thermometer should register approximately 160°F in the center. If you are serving a larger brunch, pair this sweet bake with bacon, egg, and cheese breakfast bombs for a savory option.
Make-Ahead, Storage, and Reheating
The best make-ahead method is to assemble the bread and custard, cover the dish, and refrigerate it overnight. Prepare the streusel separately if possible, keeping it chilled in a covered container, then sprinkle it over the casserole just before baking.
If you bake the casserole directly from the refrigerator, expect to allow a few extra minutes for it to heat through. Keep the foil on for the first 30 minutes, then uncover it so the topping can brown without becoming too dark.
Leftovers should be covered and refrigerated. Reheat individual portions gently until warm, or warm several portions in a baking dish; avoid overbaking, since the custardy center can become dry when heated too aggressively.
For a full brunch spread, keep this casserole as the sweet centerpiece and offer savory dishes on the side. Recipes such as a cheesy broccoli casserole can add a vegetable-forward side to the table.
Easy Serving Ideas and Variations
Maple syrup is the classic finishing touch, but powdered sugar gives the top a pretty bakery-style look. Fresh strawberries, blueberries, raspberries, sliced bananas, or lightly warmed apples bring color and a bright contrast to the buttery casserole.
You can also adapt the basic recipe with common additions such as raisins, chopped pecans, diced apples, cream cheese, or a layer of sliced bananas. Add-ins should be distributed thoughtfully so they do not create large wet pockets or make the bread layer difficult to cut.
For deeper caramel flavor, some versions add 1/2 cup brown sugar to the custard, although the recipe here uses granulated sugar in the custard and brown sugar in the streusel. If you are planning a menu for guests who prefer savory comfort food, consider serving a buffalo chicken tater tot casserole at a separate meal or gathering.
For dinner-party inspiration beyond breakfast, baked ravioli casserole is another easy dish built for sharing.
Cinnamon Breakfast Casserole Everyone Will Love
Ingredients
Method
- Butter a 9 x 13-inch baking dish and spread the bread cubes evenly inside.
- Whisk the eggs, milk, cream, granulated sugar, vanilla, cinnamon, nutmeg, and salt until thoroughly combined. Pour the custard over the bread and gently press the cubes down.
- Cover and refrigerate for at least 30 minutes, preferably overnight.
- Combine the brown sugar, flour, cinnamon, and salt for the streusel. Cut in the cold butter until coarse crumbs form.
- Heat the oven to 350°F (175°C). Sprinkle the streusel evenly over the chilled casserole.
- Bake covered with foil for about 30 minutes, then uncover and bake for another 15–25 minutes, until puffed, golden, and set in the center.
- Rest for 5–10 minutes before serving with maple syrup, powdered sugar, or fresh fruit.
Notes
Final Thoughts
This cinnamon breakfast casserole is warm, fragrant, and wonderfully practical. The overnight option lets you prepare breakfast before the day begins, while the cinnamon streusel ensures every serving feels freshly baked and inviting.
Use day-old bread, give the custard time to soak in, and stop baking once the center is set but still moist. After a short 5–10 minute rest, bring the dish to the table with maple syrup, powdered sugar, and fresh fruit for a breakfast that is simple, generous, and sure to disappear quickly.