This chocolate sheet cake delivers rich, moist layers topped with a creamy chocolate frosting — all baked in a single pan for easy serving. It comes together in about an hour and feeds a crowd without much fuss.
½cupunsweetened cocoa powderDutch-process for depth of flavor
1teaspoonbaking powderensure freshness for best rise
1teaspoonbaking soda
½teaspoonsalt
1cupunsalted buttermelted and cooled
2largeeggsat room temperature
1teaspoonvanilla extractpure
1cupbuttermilkprovides moisture and tang
Frosting Ingredients
½cupunsalted buttersoftened
¼cupunsweetened cocoa powdersifted
¼cupmilkwhole milk preferred
3cupspowdered sugarsifted to avoid lumps
1teaspoonvanilla extractpure
Instructions
Preheat your oven to 350°F (177°C). Grease and flour a 9x13 inch baking pan.
In a large bowl, combine the flour, sugar, cocoa powder, baking powder, baking soda, and salt.
In a separate bowl, whisk together the melted butter, eggs, vanilla extract, and buttermilk until smooth.
Add the wet ingredients to the dry ingredients, mixing until the batter is just combined.
Pour the batter into the prepared pan and spread it evenly. Bake for 25-30 minutes or until a toothpick inserted into the center comes out clean.
Let the cake cool in the pan on a wire rack.
For the frosting: In a medium saucepan over medium heat, melt the butter. Stir in the cocoa powder and milk, bring to a boil, then remove from heat.
Gradually stir in the powdered sugar and vanilla extract until smooth.
Pour the warm frosting over the cooled cake, spreading evenly with a spatula.
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Notes
For a deeper chocolate flavor, substitute part of the cocoa powder with dark cocoa powder. Add a pinch of espresso powder to enhance the chocolate taste. For those requiring a dairy-free option, replace butter with a quality dairy-free substitute and buttermilk with almond milk mixed with a teaspoon of lemon juice.