Texas Sheet Cake
This is the cake that disappears first at every potluck, and there's a reason for it — it comes together in one saucepan and one pan bake, and the glaze goes on while the cake is still hot, so it soaks in just slightly instead of sitting on top like frosting. That's what gives Texas sheet cake its fudgy, almost brownie-like top layer.
If you've never made one, don't overthink it. There's no layering, no leveling, no crumb coat. You boil butter and cocoa with water, mix it into the dry ingredients, bake it thin in a big pan, and pour warm glaze straight over the top. It's one of the fastest ways to feed a crowd well.
Table of Contents
Why This Recipe Works
Boiling the butter, cocoa, and water together before mixing blooms the cocoa's flavor and keeps the cake ultra-moist — this is the same trick that makes boiled-water chocolate cakes so tender. Baking the batter thin in a large sheet pan means more surface area gets that fudgy glaze-soaked top in every single bite, instead of just the top layer of a taller cake.
Ingredients
For the cake:
- ½ cup (113g) unsalted butter
- 1 cup water
- ¼ cup (25g) unsweetened cocoa powder
- 2 cups (400g) granulated sugar
- 2 cups (250g) all-purpose flour
- ½ teaspoon salt
- 1 teaspoon baking soda
- 2 large eggs
- ½ cup (120g) sour cream
- 1 teaspoon vanilla extract
For the glaze:
- ½ cup (113g) unsalted butter
- ¼ cup (25g) unsweetened cocoa powder
- ⅓ cup whole milk
- 3¾ cups (450g) powdered sugar
📋 Recipe Card
Texas Sheet Cake
- 1 cup (226g) butter, divided
- 1 cup water
- ½ cup (50g) cocoa powder, divided
- 2 cups (400g) granulated sugar
- 2 cups (250g) all-purpose flour
- 2 large eggs
- ½ cup (120g) sour cream
- 3¾ cups (450g) powdered sugar
- Boil half the butter, water, and half the cocoa. Whisk into flour, sugar, salt, and baking soda.
- Whisk in eggs, sour cream, and vanilla until smooth.
- Pour into a greased 18x13-inch sheet pan and bake at 350°F (175°C) for 18-22 minutes.
- Boil remaining butter, cocoa, and milk; whisk in powdered sugar for the glaze.
- Pour warm glaze over the hot cake immediately and spread evenly.
- Let set 20 minutes before slicing.
Step-by-Step
Step 1: Make the Cake Base
Bring the butter, water, and cocoa powder to a full boil in a saucepan, stirring occasionally. Pour it immediately over the flour, sugar, salt, and baking soda in a large bowl and whisk until smooth.
Step 2: Add the Wet Ingredients
Whisk in the eggs, sour cream, and vanilla until the batter is fully smooth with no streaks.
Step 3: Bake
Pour the batter into a greased 18x13-inch sheet pan and spread it evenly. Bake at 350°F (175°C) for 18 to 22 minutes, until a toothpick inserted in the center comes out clean.
Step 4: Make the Glaze
While the cake bakes, bring the remaining butter, cocoa, and milk to a boil in a saucepan. Remove from heat and whisk in the powdered sugar until smooth and pourable.
Step 5: Glaze the Hot Cake
The moment the cake comes out of the oven, pour the warm glaze evenly over the top and spread it with an offset spatula. Working fast while both are still warm is what lets the glaze soak slightly into the cake.
Step 6: Cool and Slice
Let the glaze set for at least 20 minutes at room temperature before slicing into squares.
Pro Tips
- Have the glaze ready before the cake finishes baking: the glaze needs to go on while the cake is still hot, so time it to be ready a few minutes early.
- Use a full-size sheet pan: a smaller pan makes the cake too thick and changes the texture the recipe is built around.
- Don't overbake: the thin batter bakes fast — start checking at the 18-minute mark.
- Grease the pan well: this cake doesn't use parchment, so a generous coat of butter or spray keeps it from sticking.
Storage & Make-Ahead
Cover the pan and store at room temperature for up to 3 days, or refrigerate for up to a week. The cake also freezes well — slice, wrap individual squares, and freeze up to 3 months. Thaw at room temperature for about 30 minutes before serving.
Variations & Substitutions
- Pecan topping: stir 1 cup chopped toasted pecans into the glaze right before pouring, a classic Texas addition.
- Buttermilk swap: use buttermilk in place of sour cream for a slightly tangier, lighter crumb.
- Cinnamon note: add ½ teaspoon cinnamon to the batter for a Mexican-chocolate-inspired variation.
- Smaller batch: halve the recipe and bake in a 9x13-inch pan for about 20-25 minutes.
FAQ
Final Thoughts
This is one of those recipes that looks impressive but takes almost no real effort — one bowl, one pan, and a glaze poured straight on. It holds up well the next day too, which is rare for a frosted cake.