Texas Sheet Chocolate Cake (Printable)

A moist Southern chocolate sheet cake with warm, fudgy icing delivering rich and decadent flavors.

# What You'll Need:

→ Cake

01 - 2 cups all-purpose flour
02 - 2 cups granulated sugar
03 - 1/2 teaspoon salt
04 - 1 teaspoon baking soda
05 - 1/2 teaspoon ground cinnamon (optional)
06 - 1 cup unsalted butter (2 sticks)
07 - 1 cup water
08 - 1/4 cup unsweetened cocoa powder
09 - 2 large eggs
10 - 1/2 cup sour cream
11 - 1 teaspoon vanilla extract

→ Fudgy Icing

12 - 1/2 cup unsalted butter (1 stick)
13 - 1/4 cup unsweetened cocoa powder
14 - 1/3 cup whole milk
15 - 3 1/2 cups powdered sugar, sifted
16 - 1 teaspoon vanilla extract
17 - 1 cup chopped pecans or walnuts (optional)

# Directions:

01 - Preheat oven to 350°F. Grease and flour a 13x18-inch rimmed baking sheet.
02 - Whisk together flour, sugar, salt, baking soda, and cinnamon (if using) in a large bowl.
03 - In a medium saucepan, combine butter, water, and cocoa powder and bring to a gentle boil over medium heat, stirring until smooth.
04 - Pour hot chocolate mixture over dry ingredients and stir until thoroughly combined.
05 - Whisk eggs, sour cream, and vanilla in a separate bowl. Add to batter and mix until smooth.
06 - Transfer batter to prepared pan and smooth the surface. Bake 18–20 minutes until a toothpick inserted in the center comes out clean.
07 - While cake bakes, melt butter with cocoa and milk over medium heat until just boiling, stirring until smooth. Remove from heat.
08 - Immediately whisk in sifted powdered sugar and vanilla until smooth. Stir in nuts if desired.
09 - Pour warm icing over hot cake as soon as it comes out of the oven, spreading quickly with an offset spatula.
10 - Allow to cool at room temperature until icing is set. Cut into squares and serve.

# Expert Tips:

01 -
  • It comes together faster than you'd think for a dessert this spectacular, and your kitchen will smell like a chocolate factory exploded in the best way.
  • The texture is pure nostalgia—dense, moist, almost gooey in the center where the icing soaks in, and nothing like those dry sheet cakes you've probably had at gatherings.
  • It feeds a crowd without requiring you to dirty every bowl in your kitchen, making it the unofficial hero of potlucks and casual dinner parties.
02 -
  • The icing must go on while both the cake and the icing are hot, or it won't fuse and create that signature texture—if your icing starts to cool, reheat it gently because cool icing just sits on top instead of seeping into the cake.
  • Using a rimmed sheet pan instead of a regular cake pan is essential; flat sides means even baking and a cake that fits on your serving platter without crumbling off the edges.
03 -
  • Don't skip sifting the powdered sugar for the icing—those little lumps will persist and create a grainy texture that undermines the whole silky fudgy vibe.
  • If your icing firms up too quickly before you've spread it all, just gently reheat it for 30 seconds and it'll be pourable again without breaking down.
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