Texas sheet cake is a beloved American dessert known for its rich chocolate flavor, tender crumb, and signature fudgy frosting poured over the top while the cake is still warm. This version uses a boxed cake mix to save time without sacrificing the classic taste and texture. The result is a moist, decadent sheet cake that’s perfect for feeding a crowd.
Ingredients
- 1 box (15.25 oz / 432 g) chocolate cake mix
- 3 large eggs
- 1 cup (240 ml) buttermilk (or 1 cup milk + 1 tbsp lemon juice, let sit 5 min)
- 1/2 cup (120 ml) vegetable oil
- 1 tsp vanilla extract
- 1 cup (226 g) unsalted butter
- 1/4 cup (25 g) unsweetened cocoa powder
- 6 tbsp (90 ml) milk
- 1 lb (453 g) powdered sugar (about 3 3/4 cups)
- 1 tsp vanilla extract (for frosting)
- 1 cup (120 g) chopped pecans or walnuts (optional)
Instructions
- Preheat oven to 350°F (175°C). Grease a 13×18-inch (half-sheet) jelly roll pan or a 9×13-inch pan (adjust baking time if using a smaller pan).
- In a large bowl, combine the cake mix, eggs, buttermilk, oil, and 1 tsp vanilla. Beat with an electric mixer on medium speed for 2 minutes, until smooth and well combined.
- Pour the batter into the prepared pan and spread evenly. Bake for 25–30 minutes for a half-sheet pan, or 35–40 minutes for a 9×13-inch pan, or until a toothpick inserted in the center comes out clean. (For a 9×13 pan, start checking at 35 minutes.)
- While the cake bakes, make the frosting: In a medium saucepan, melt the butter over medium heat. Stir in the cocoa powder and milk. Bring to a gentle boil, then remove from heat.
- Whisk in the powdered sugar and 1 tsp vanilla until smooth. If the frosting seems too thick, add a little more milk (1 tbsp at a time). If too thin, let it cool slightly.
- Stir in the chopped nuts, if using.
- Remove the cake from the oven and immediately pour the warm frosting over the hot cake. Spread evenly with a spatula.
- Let the cake cool completely on a wire rack before slicing and serving. The frosting will set as it cools.
Tips
- Use buttermilk: Buttermilk adds a subtle tang and helps activate the leavening in the cake mix, giving a more tender crumb. If you don’t have buttermilk, make a quick substitute by adding 1 tbsp lemon juice or vinegar to 1 cup milk and letting it sit for 5 minutes.
- Don’t overbake: The cake should be just set in the center. Overbaking will make it dry. Start checking a few minutes before the suggested time.
- Pour frosting on hot cake: The frosting must be poured over the cake while both are warm. This allows the frosting to seep slightly into the cake, creating that classic fudgy layer.
- Storage: Cover the pan tightly with foil or plastic wrap. The cake keeps well at room temperature for up to 3 days, or in the fridge for up to 5 days. Bring to room temperature before serving for best flavor.
Serving Suggestions
Serve Texas sheet cake as is, or with a scoop of vanilla ice cream, a dollop of whipped cream, or a drizzle of chocolate sauce. It’s perfect for potlucks, birthdays, and family gatherings. Cut into squares and serve on a platter.
Variations
- German Chocolate Twist: Use a German chocolate cake mix and top with coconut-pecan frosting instead of the chocolate fudge frosting.
- Peppermint: Add 1/2 tsp peppermint extract to the frosting and sprinkle crushed candy canes on top.
- Mocha: Dissolve 1 tbsp instant espresso powder in the milk before adding to the frosting for a coffee-chocolate flavor.
- Gluten-Free: Use a gluten-free chocolate cake mix and ensure all other ingredients are gluten-free.
Storage and Reheating
Store leftover cake in an airtight container at room temperature for up to 3 days, or refrigerate for up to 5 days. To freeze, wrap the unfrosted or frosted cake tightly in plastic wrap and then foil; freeze for up to 3 months. Thaw overnight in the refrigerator and bring to room temperature before serving. To reheat individual slices, microwave for 10–15 seconds until just warm.
Frequently Asked Questions
Can I use a different flavor of cake mix? Yes, you can use white, yellow, or even red velvet cake mix. The frosting will still be chocolate, so choose a flavor that pairs well.
Can I make this cake in a different pan size? Yes, you can use a 9×13-inch pan, but the cake will be thicker and need more baking time (35–40 minutes). You can also use two 8-inch round pans, but adjust baking time to about 25–30 minutes.
Why is my frosting grainy? Grainy frosting usually happens when the powdered sugar isn’t fully dissolved. Make sure to whisk thoroughly, and consider sifting the powdered sugar before adding. Also, ensure the butter mixture is hot enough to dissolve the sugar.
Can I skip the nuts? Absolutely. The nuts are optional and can be omitted or replaced with shredded coconut, chocolate chips, or nothing at all.
How do I know when the cake is done? Insert a toothpick into the center. If it comes out clean or with a few moist crumbs, it’s done. The edges will also pull away slightly from the pan.
Can I use a homemade chocolate cake recipe instead? Yes, you can substitute your favorite homemade chocolate cake recipe. Just adjust the baking time according to that recipe.
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