Texas Sheet Cake Recipe With Buttermilk: Rich Chocolate Layers in One Pan

This Texas sheet cake delivers rich chocolate flavor in every bite, with a moist crumb that only buttermilk can provide. The recipe comes together in one pan, making it as practical as it is delicious.

You’ll get a perfectly tender cake with a glossy chocolate frosting that sets as it cools. It serves a crowd and keeps well, making it ideal for gatherings or weeknight treats.

Ingredients for Texas Sheet Cake Recipe with Buttermilk

One bowl, one pan, twelve servings of pure chocolate bliss with signature buttermilk richness.

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The buttermilk is non-negotiable here—full-fat from a trusted brand like Organic Valley gives that signature tang and moisture. For cocoa powder, Hershey’s Special Dark is my go-to for that deep chocolate flavor. Most supermarkets carry it, but Whole Foods has a great bulk section if you want to stock up. The flour should be fresh; old flour loses its lift, and this cake needs all the help it can get to stay tender.

No buttermilk? Whole milk plus 1 tbsp vinegar or lemon juice per cup works in a pinch. Out of Dutch-process cocoa? Regular unsweetened cocoa is fine, just add a pinch of baking soda to the batter. The frosting needs that extra cocoa punch—don’t skip it. And if you’re using salted butter, reduce the added salt by half.

This cake stays moist for 3-4 days at room temperature in an airtight container. The frosting sets as it cools, so don’t rush it. Leftovers? They’ll disappear fast, but technically keep for 5 days.

Step-by-Step Instructions for Texas Sheet Cake With Buttermilk

This one-pan wonder comes together quickly and delivers layers of deep chocolate flavor.

Step 1: Prepare the Cake Batter with Cocoa Bloom

In a large mixing bowl, whisk together the 2 cups All-Purpose Flour, 2 cups Granulated Sugar, and 0.5 cup Unsweetened Cocoa Powder. I always sift the flour first for a lighter texture, but you can whisk vigorously to break up any lumps.

In a separate bowl, combine the 1 cup Buttermilk, 2 whole Large Eggs, and 1 tsp Vanilla Extract. Then, in a small saucepan, melt the 1 cup Unsalted Butter with the 1 cup Hot Water over medium heat. Once hot, pour this mixture over the dry ingredients and stir until just combined—the batter will be thin, which is perfect.

Step 2: Bake Until Springy and Aromatic

Pour the batter into a greased 18×13-inch sheet pan, spreading it evenly with a spatula. Bake in a preheated 350°F oven for 20-25 minutes, or until a toothpick inserted in the center comes out clean.

You’ll know it’s done when the top springs back lightly when pressed and the edges start to pull away from the pan. The aroma of rich chocolate will fill your kitchen—that’s your cue the cake is ready for the frosting.

Step 3: Make the Chocolate Frosting While Cake Bakes

About 5 minutes before the cake is done, start the frosting. In a medium saucepan, melt the 0.75 cup Unsalted Butter over medium heat. Stir in the 0.33 cup Unsweetened Cocoa Powder until smooth, then alternately add the 3.5 cups Powdered Sugar and 0.33 cup Buttermilk, mixing well after each addition.

Once fully combined, remove from heat and stir in the 1 tsp Vanilla Extract. The frosting should be glossy and pourable. If it thickens too much, add a splash more buttermilk to reach a spreadable consistency.

Step 4: Frost the Warm Cake for Maximum Absorption

As soon as the cake comes out of the oven, pour the warm frosting evenly over the hot cake. Use a spatula to spread it gently to the edges. The heat from the cake will help the frosting set into a smooth, fudgy layer.

Let the cake cool completely in the pan on a wire rack, about 1 hour. The frosting will firm up as it cools, creating that signature Texas sheet cake texture—rich, dense, and intensely chocolatey.

Slice into squares and serve at room temperature. The buttermilk in both the cake and frosting adds a subtle tang that balances the sweetness perfectly.

Essential Equipment for This Dish

Baking Pan

You absolutely need a 18×13-inch rimmed sheet pan—this is non-negotiable for authentic Texas sheet cake. I use a USA Pan with a nonstick coating, which releases the cake cleanly and browns evenly. Avoid glass pans, as they can cause uneven baking.

Mixing Bowls

A large mixing bowl (at least 4-quart capacity) is essential for the batter. I prefer stainless steel because it’s durable and won’t absorb odors. A second medium bowl helps for combining the wet ingredients separately.

Whisk and Spatula

A sturdy balloon whisk ensures smooth mixing of the dry ingredients, while a silicone spatula helps scrape every bit of batter into the pan. I swear by OXO’s Good Grips line—they’re comfortable and built to last. 💛

Saucepan for Frosting

Use a medium saucepan (about 2-quart) for the frosting to prevent spills. Heavy-bottomed pans like All-Clad distribute heat evenly, preventing hot spots that could scorch the butter or cocoa. Avoid nonstick for this step—it’s not necessary.

Cooling Rack

A wire cooling rack lets air circulate under the pan, helping the cake cool evenly. I place mine directly on the counter, but a rack over a baking sheet catches any drips. This step ensures the frosting sets properly without pooling.

Measuring Tools

Precise measurements matter here. Use dry measuring cups for flour and sugar, and liquid measuring cups for buttermilk and water. A set of measuring spoons for vanilla and cocoa is a must. I keep a Pyrex 2-cup for liquids and nested dry cups for everything else.

Frequently Asked Questions