Instructions
1. Prepare the Cake
- Preheat Oven: Preheat your oven to 350°F (175°C). Grease a 13×18-inch rimmed baking sheet or jelly roll pan.
- Mix Dry Ingredients: In a large bowl, whisk together the flour, sugar, salt, baking soda, and cinnamon (if using). Set aside.
- Heat Wet Ingredients: In a medium saucepan over medium heat, combine the butter, water, and cocoa powder. Stir until the butter is melted and the mixture is smooth. Bring to a gentle boil, then remove from heat.
- Combine Wet and Dry: Pour the warm cocoa mixture into the flour mixture and stir until just combined.
- Add Remaining Ingredients: In a separate bowl, whisk together the sour cream, eggs, and vanilla extract. Add this to the batter and stir until smooth.
- Pour into Pan: Pour batter into the prepared baking sheet and spread evenly.
2. Bake the Cake
- Bake: Bake for 18-20 minutes, or until a toothpick inserted into the center comes out clean. While baking, prepare the icing.
3. Make the Icing
- Heat Butter and Cocoa: In a medium saucepan over medium heat, melt the butter. Add the cocoa powder and milk, whisking until smooth. Bring to a gentle simmer, then remove from heat.
- Add Powdered Sugar and Vanilla: Gradually whisk in the powdered sugar until smooth. Stir in the vanilla extract.
- Add Nuts (Optional): Fold in the chopped pecans or walnuts if desired.
4. Finish the Cake
- Pour Icing: Immediately pour the warm icing over the hot cake. Use an offset spatula to spread evenly.
- Cool: Let cool completely in the pan before slicing and serving.
Cooking Notes
- Icing Consistency: Pouring the icing over while both are warm ensures easy spreading and a fudgy texture.
- Storage: Store leftovers in an airtight container at room temperature for up to 3 days, or refrigerate for up to 5 days.
Variations
- Cinnamon Twist: Add cinnamon to the batter for a spiced note.
- Buttermilk Substitute: Use buttermilk, or mix 1/2 cup milk with 1 tablespoon lemon juice/vinegar (let sit 5 minutes).
- White Texas Sheet Cake: Omit cocoa; add almond extract to batter and icing.
Frequently Asked Questions (FAQs)
Can I make this ahead?
Yes! Once cooled, store in an airtight container at room temperature or in the refrigerator for 3-5 days.
How do I store leftovers?
Store in an airtight container at room temperature for up to 3 days, or refrigerate for up to 5 days.
Can I freeze it?
Yes! Wrap slices tightly, place in an airtight container or freezer bag. Freeze for up to 2 months. Thaw overnight in the refrigerator.
What to serve it with?
Vanilla ice cream, whipped cream, milk, or coffee are all great pairings.
Can I use a smaller pan?
A 13×18-inch pan is best for the classic thinner cake. A smaller pan will result in a thicker cake; adjust baking time accordingly.

Texas Sheet Cake is a true crowd-pleaser—simple to make and full of rich chocolate flavor. Its moist texture and delicious warm icing make it a guaranteed hit! Its easy preparation is perfect for casual get-togethers, and its irresistible taste ensures everyone will love it. Try this classic recipe for a delicious treat!
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