Easy German Chocolate Sheet Cake Recipe with Coconut Pecan Frosting

There is something undeniably comforting about a homemade sheet cake cooling on the kitchen counter. While my oven is frequently occupied by fruit-forward bakes like my signature Strawberry Shortcake Cookies Recipe, a rich, dark chocolate cake holds a permanent spot in my dessert rotation. This German chocolate sheet cake brings together a tender, buttery crumb and a thick, velvety layer of golden coconut and pecan frosting. It skips the stress of stacking multiple layers, giving you all the classic flavors in a format that is simple to bake, slice, and share.

The aroma that fills the room while this bakes is incredible. It is a deep, warm scent of melting chocolate and sweet vanilla, followed quickly by the nutty, toasted fragrance of pecans simmering on the stove. This is a dessert meant for casual Sunday dinners, potlucks, or any moment that calls for a deeply satisfying sweet treat.

Why You’ll Love This

• It feeds a crowd effortlessly without the hassle of leveling, stacking, or crumb-coating multiple cake layers.

• The cake base remains incredibly moist and tender for days thanks to the addition of real buttermilk.

• The scratch-made frosting balances sweet, caramelized flavors with a satisfying crunch from toasted pecans.

• It is a nostalgic, crowd-pleasing classic that appeals to both chocolate lovers and fans of textured desserts.

The Backstory

My grandfather was a notoriously strict dessert traditionalist who generally scoffed at modern twists on old recipes. He also claimed to strongly dislike shredded coconut, avoiding it in every cookie or pie that crossed his path. One afternoon, I brought this sheet cake to a family gathering, deliberately staying quiet about the ingredients. He reached for a square, caught a whiff of the warm, buttery brown sugar frosting, and took a bite. Not only did he finish his piece, but he also quietly asked for a second slice to take home. It turns out that when coconut is simmered into a creamy, golden custard with rich butter and toasted nuts, even the toughest critics can completely change their minds.

What Makes It Special

• Sweet Baking Chocolate: Using traditional German sweet chocolate in the batter creates a milder, smoother chocolate flavor profile than bitter cocoa powder alone.

• Buttermilk: This provides the essential acidity needed to activate the baking soda, ensuring a light, tender crumb that never turns out dry.

• Toasted Pecans: Roasting the nuts beforehand coaxes out their natural oils, adding a smoky, deeply nutty depth to every bite.

• Egg Yolks in the Frosting: Simmering the frosting base with egg yolks creates a rich, custard-like texture that binds the coconut and pecans beautifully.

Making It Happen

To bring this cake together, start by melting the sweet baking chocolate with a splash of water until it is completely smooth and liquid. In a large bowl, sift together your flour, baking soda, and a pinch of salt to ensure there are no lumps. In your mixer, beat the softened butter and sugar together until the mixture looks pale and fluffy, then incorporate the egg yolks one by one. Once the melted chocolate has cooled slightly, swirl it into the butter mixture along with a generous splash of vanilla extract.

Next, alternate adding your dry flour mixture and the buttermilk into the wet ingredients, stirring gently just until a cohesive batter forms. In a separate, clean bowl, whip your egg whites until they hold stiff peaks, then gently fold them into the cake batter to trap air and guarantee a light texture. Pour the smooth batter into a prepared sheet pan and bake until a toothpick inserted in the center comes out clean.

While the cake bakes, focus on the iconic frosting. Combine the evaporated milk, sugar, butter, and egg yolks in a saucepan over medium heat, stirring constantly so the eggs do not scramble. Bring the mixture to a gentle simmer until it thickens into a golden, velvety custard. Remove the pan from the heat and stir in the shredded coconut and toasted pecans, allowing the frosting to cool down and thicken up before spreading it evenly over the top of your cooled sheet cake.

You Must Know

• Always let your melted chocolate cool to room temperature before adding it to the butter mixture to prevent the eggs from cooking.

• Do not skip the step of whipping and folding the egg whites, as this is the secret to keeping a dense chocolate cake light.

• Keep a close eye on the frosting custard while it is on the stovetop; constant stirring prevents the bottom from scorching.

• Let the cake cool completely before applying the frosting so the topping stays thick and doesn’t melt into the cake sponge.

Serving Ideas & Pairings

This rich cake pairs beautifully with a steaming mug of dark roast coffee or a cold glass of milk to balance the sweetness of the coconut frosting. If you want to serve it as a plated dessert for a dinner party, a small scoop of tart raspberry sorbet or vanilla bean ice cream on the side offers a wonderful temperature contrast. It also stands alone perfectly, sliced into generous squares and served right out of the baking pan.

Make It Different

If you need to adapt this recipe for a gluten-free diet, a high-quality 1:1 gluten-free baking flour blend swaps seamlessly into the cake batter. For a deeper flavor contrast, you can replace the traditional sweet baking chocolate with a dark chocolate containing 60% cacao, which tames the sweetness and highlights the rich cocoa notes. If someone has a tree nut allergy, toasted sunflower seeds or rolled oats can replace the pecans in the frosting to maintain that essential crunch.

Storage & Reheating

Store any leftovers in an airtight container or cover the baking pan tightly with plastic wrap. The cake keeps well at room temperature for up to two days, or in the refrigerator for up to five days. If you prefer your cake warm, place a single slice on a microwave-safe plate and heat it on low power for 10 to 15 seconds. This softens the butter in the cake and makes the caramel-like frosting beautifully gooey again.

Success Tips

To get the most flavor out of your ingredients, always toast your pecans in a dry skillet over medium heat for 3 to 5 minutes until they are fragrant. Let them cool completely before chopping. Additionally, using room-temperature eggs and buttermilk ensures the batter emulsifies perfectly without curdling, which leads to an even rise in the oven.

Frequently Asked Questions (FAQ)

Can I use regular cocoa powder instead of sweet baking chocolate?

While you can use cocoa powder in a pinch, traditional German sweet chocolate gives the cake its distinct, mild flavor profile. If you must use cocoa powder, add an extra tablespoon of sugar to balance the bitterness.

Do I have to use sweetened coconut for the frosting?

Sweetened flaked coconut is traditional and helps create the classic gooey texture. If you want to reduce the sweetness slightly, you can use unsweetened shredded coconut, but the final texture may be slightly drier.

Can this sheet cake be frozen for later?

Yes, you can freeze the un-frosted cake wrapped tightly in plastic wrap and foil for up to three months. It is best to make the coconut pecan frosting fresh on the day you plan to serve it.

Why did my frosting turn out too runny?

The frosting needs to simmer long enough on the stovetop to thicken into a custard consistency before you add the coconut and pecans. It will also continue to thicken significantly as it cools down.

Can I make this recipe in a 9×13 inch pan instead of a sheet pan?

Yes, this recipe adapts well to a standard 9×13 baking pan. You will just need to extend the baking time by 5 to 10 minutes since the cake will be thicker than a traditional flat sheet cake.

Recipe Card Info

Prep time: 25 minutes

Cook time: 35 minutes

Total time: 1 hour

Servings: 16 servings

Category: Dessert

Difficulty: Intermediate

Cuisine: American

Yield: 1 sheet cake

Equipment: 12×17 inch jelly roll pan, saucepan, hand mixer, mixing bowls, silicone spatula

Ingredients

• 4 ounces German sweet baking chocolate, chopped

• 1/2 cup water

• 1 cup unsalted butter, softened

• 2 cups granulated sugar

• 4 large eggs, separated

• 1 teaspoon vanilla extract

• 2 1/2 cups all-purpose flour

• 1 teaspoon baking soda

• 1/2 teaspoon salt

• 1 cup buttermilk

• 1 cup evaporated milk (for the frosting)

• 1 cup granulated sugar (for the frosting)

• 3 large egg yolks (for the frosting)

• 1/2 cup unsalted butter (for the frosting)

• 1 teaspoon vanilla extract (for the frosting)

• 1 1/3 cups sweetened flaked coconut

• 1 cup pecans, toasted and chopped

Instructions

Preheat your oven to 350°F (175°C). Grease and flour a 12×17 inch sheet pan or jelly roll pan, then set it aside.

In a small saucepan over low heat, combine the chopped sweet baking chocolate and 1/2 cup of water. Stir constantly until the chocolate is entirely melted and smooth, then remove it from the heat and let it cool to room temperature.

In a large mixing bowl, cream together 1 cup of softened butter and 2 cups of sugar using an electric mixer until light and fluffy. Beat in the 4 egg yolks one at a time, mixing well after each addition. Stir in the cooled melted chocolate and 1 teaspoon of vanilla extract.

In a separate bowl, whisk together the all-purpose flour, baking soda, and salt. Alternately add the flour mixture and the buttermilk to the chocolate mixture, blending on low speed just until combined.

In a clean, dry bowl, beat the 4 egg whites on high speed until stiff peaks form. Gently fold the whipped egg whites into the cake batter using a silicone spatula until no white streaks remain. Spread the batter evenly into your prepared sheet pan.

Bake for 30 to 35 minutes, or until a toothpick inserted into the center of the cake comes out clean. Set the pan on a wire rack to cool completely.

To make the frosting, combine the evaporated milk, 1 cup of sugar, 3 egg yolks, and 1/2 cup of butter in a medium saucepan over medium heat. Bring to a gentle boil, stirring constantly, and cook for about 12 minutes until the mixture thickens into a golden custard.

Remove the saucepan from the heat. Stir in the vanilla extract, sweetened flaked coconut, and chopped toasted pecans. Let the frosting cool until it reaches a spreadable consistency, then spread it evenly over the top of the cooled cake.

Notes

For the cleanest slices, wipe your knife with a warm, damp paper towel between each cut. This prevents the sticky coconut pecan frosting from pulling up the crumbs of the delicate chocolate cake underneath.

Nutrition

• Calories: 480 kcal

• Carbohydrates: 56g

• Protein: 6g

• Fat: 27g

• Saturated Fat: 14g

• Cholesterol: 105mg

• Sodium: 210mg

• Fiber: 2g

• Sugar: 42g