There are breakfast casseroles, and then there are show-stopping, holiday-worthy creations that bring people to the table. This King Cake Cinnamon Roll Casserole is the latter. It takes the beloved flavors of a classic cinnamon roll—soft, buttery dough, warm cinnamon spice, and sweet icing—and transforms them into a custardy, pull-apart casserole inspired by the vibrant tradition of Mardi Gras. With a nod to the King Cake’s signature purple, green, and gold sprinkles, this dish is as festive as it is delicious.
The magic happens in the custard. Refrigerated cinnamon roll dough is cut into bite-sized pieces and soaked in a rich mixture of eggs, milk, heavy cream, brown sugar, vanilla, and cinnamon. As it bakes, the dough puffs up, the custard sets into a creamy, bread-pudding-like layer, and the edges become golden and slightly crisp. A drizzle of the included icing and a shower of colorful sprinkles transform this breakfast casserole into a celebration.
Perfect for Mardi Gras morning, Fat Tuesday brunch, Christmas breakfast, or any day you want to start with something special. Serve it warm with coffee or mimosas, and watch it disappear.
Why You’ll Love This Recipe
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Uses refrigerated cinnamon roll dough (a simple shortcut)
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Rich, custardy, and cinnamon-spiced
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Topped with the iconic icing and colorful sprinkles
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Perfect for Mardi Gras, holidays, or special brunches
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Feeds a crowd with minimal effort
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Tastes like a bakery-style king cake in casserole form
Sweet Blend King Cake Cinnamon Roll Casserole
Prep Time: 15 minutes | Resting Time: 15 minutes | Bake Time: 30-40 minutes | Total Time: Approximately 1 hour 10 minutes
Yield: 8 servings
Ingredients
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2 (12-13 ounce) cans refrigerated cinnamon roll dough, with icing packets
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3 large eggs
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1 cup whole milk
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½ cup heavy cream
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⅓ cup packed light or dark brown sugar
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2 teaspoons pure vanilla extract
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1½ teaspoons ground cinnamon
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¼ teaspoon fine sea salt
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2 tablespoons unsalted butter, softened, for greasing the dish
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Optional: 2-3 tablespoons colorful sanding sugar or sprinkles (purple, green, and gold for a king cake nod)
Instructions
1. Preheat and Prepare:
Preheat your oven to 350°F (175°C). Generously butter a 9×13-inch glass casserole dish, making sure to coat the bottom and sides so the cinnamon rolls do not stick.
2. Prepare the Cinnamon Rolls:
Open the cans of refrigerated cinnamon rolls and set the icing packets aside for later. Cut each cinnamon roll into 4 to 6 bite-sized pieces and scatter them evenly in the prepared baking dish.
3. Make the Custard:
In a medium mixing bowl, whisk the eggs until the yolks and whites are fully combined. Add the whole milk, heavy cream, brown sugar, vanilla extract, ground cinnamon, and salt. Whisk until the brown sugar is dissolved and the mixture looks smooth and evenly speckled with cinnamon.
4. Pour Over the Dough:
Slowly pour the custard mixture over the cinnamon roll pieces, making sure to cover all the pieces so they soak up the custard. Gently press down any pieces that sit too high so everything is lightly moistened.
5. Let It Soak:
Let the dish rest on the counter for 10 to 15 minutes to allow the cinnamon roll pieces to start absorbing the custard. This short soak helps the casserole bake up custardy rather than dry.
6. Bake:
Place the dish on the center rack of the preheated oven and bake for 30 to 40 minutes, or until the top is puffed and golden brown and the custard is set in the center. A knife inserted in the middle should come out mostly clean, with no liquid custard clinging to it.
7. Cool and Ice:
Remove the casserole from the oven and let it cool for about 10 minutes. While it rests, knead the icing packets briefly with your hands to soften them, then snip the corners and drizzle the icing generously over the warm casserole. If using, sprinkle with purple, green, and gold sanding sugar for a king cake effect.
8. Serve:
Serve warm, scooping the casserole into bowls or onto plates so everyone gets a mix of soft, custardy center and golden edges.
Recipe Notes & Pro Tips
What is King Cake? King Cake is a traditional Mardi Gras dessert associated with the Carnival season. It is a ring-shaped, cinnamon-spiced cake decorated with purple (justice), green (faith), and gold (power) sugars. A small plastic baby is often hidden inside, and the person who finds it is responsible for hosting the next party. This casserole captures the flavors and festive colors of a traditional king cake in an easy, shareable format.
Do Not Skip the Soak: Letting the cinnamon roll pieces sit in the custard for 10-15 minutes before baking is essential. This allows the dough to absorb the liquid, resulting in a custardy, bread-pudding-like texture rather than a dry, bready casserole.
Cinnamon Roll Brand: Any brand of refrigerated cinnamon roll dough works. Pillsbury is widely available, but store brands work well too. The icing packets included with the dough are used for the topping—do not discard them.
Make Ahead: You can assemble the casserole the night before. Arrange the cinnamon roll pieces in the buttered dish, pour the custard over the top, cover with plastic wrap, and refrigerate overnight. In the morning, let it sit at room temperature for 15-20 minutes while the oven preheats, then bake as directed (add 5-10 minutes to the baking time since you are starting from cold).
Add the Baby (Optional): For a true king cake experience, hide a small plastic baby (or a dried bean or pecan) in the casserole before baking. Warn your guests! The person who finds it gets good luck—or hosts the next party.
No Sprinkles? Use Colored Sugar: If you cannot find purple, green, and gold sprinkles, make your own colored sugar by mixing granulated sugar with a few drops of food coloring in a small bowl. Spread on a baking sheet to dry before using.
Variations
Cream Cheese King Cake Casserole: Drop 4 ounces of softened cream cheese by small spoonfuls over the cinnamon roll pieces before adding the custard. The cream cheese adds tanginess and richness.
Apple Cinnamon King Cake: Add 1 cup of finely chopped fresh apples (peeled, Granny Smith or Honeycrisp) to the casserole along with the cinnamon roll pieces. The apples soften during baking and add fruity sweetness.
Pecan King Cake: Sprinkle ½ cup of chopped pecans over the cinnamon roll pieces before adding the custard. The nuts add crunch and toasty flavor.
Chocolate King Cake: Add ½ cup of mini chocolate chips to the casserole along with the cinnamon roll pieces. The chocolate melts into gooey pockets throughout.
Bourbon King Cake: Add 2 tablespoons of bourbon to the custard mixture. The bourbon adds warmth and depth, complementing the cinnamon and vanilla.
Raspberry King Cake: Dollop ½ cup of raspberry preserves over the cinnamon roll pieces before adding the custard. Swirl gently with a knife. The tart raspberry balances the sweetness.
Serving Suggestions
This rich, sweet casserole is a meal on its own, but it pairs beautifully with:
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Fresh berries (strawberries, blueberries, raspberries)
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Whipped cream
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A dusting of powdered sugar
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Hot coffee or café au lait
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Mimosas or sparkling cider
For a complete Mardi Gras brunch, serve alongside:
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Scrambled eggs and bacon
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Fresh fruit salad
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Andouille sausage or grits
Storage & Reheating
Store leftovers in an airtight container in the refrigerator for up to 3 days.
To reheat, place individual portions in the microwave in 30-45 second bursts, or warm the entire casserole in a 300°F oven for 10-15 minutes, covered with foil to prevent the top from drying out. The icing will soften when reheated.
This casserole does not freeze well, as the texture of the custard becomes watery upon thawing.
Why This Recipe Works
This casserole is essentially a baked French toast or bread pudding made with cinnamon roll dough instead of bread. The dough is enriched with butter and sugar, making it soft and tender. Cutting it into bite-sized pieces increases the surface area, allowing the custard to soak in more thoroughly.
The custard—made with eggs, milk, cream, brown sugar, vanilla, and cinnamon—is rich and flavorful. The heavy cream adds extra richness, while the brown sugar provides a deeper, molasses-like sweetness than granulated sugar. The eggs bind everything together, creating a set, custardy texture.
Baking the casserole in a buttered dish creates golden, slightly crisp edges while the center remains soft and creamy. The icing, drizzled on while the casserole is still warm, melts slightly into the top, creating a sweet, glossy finish. The colorful sprinkles add the festive king cake touch.
This recipe is proof that breakfast can be both easy and extraordinary. With refrigerated dough and a simple custard, you can create a casserole that tastes like a bakery specialty. Perfect for Mardi Gras, Christmas morning, or any day you want to celebrate.