Description
A tender, super-vanilla sheet cake with rich, buttery frosting inspired by Costco’s famous dessert.
Ingredients
- 2 cups all-purpose flour
- 1 1/2 cups granulated sugar
- 1 tablespoon baking powder
- 1/2 teaspoon salt
- 1 cup (2 sticks) unsalted butter, softened (for cake)
- 4 large eggs, room temperature
- 1 tablespoon vanilla extract
- 1 cup whole milk
- 4 cups powdered sugar, sifted if lumpy (for frosting)
- 1/2 cup (1 stick) unsalted butter, softened (for frosting)
- 1 teaspoon vanilla extract (for frosting)
- 1/4 cup heavy cream (optional — to adjust frosting consistency)
Instructions
- Preheat oven to 350°F (175°C). Grease and lightly flour a 9×13-inch sheet pan or line it with parchment.
- In a large bowl, whisk together flour, sugar, baking powder, and salt.
- Add softened butter to the dry mix and work it in until the mixture resembles coarse crumbs.
- Add eggs one at a time, mixing after each addition until smooth. Stir in vanilla extract.
- Pour in whole milk and mix until smooth and pourable.
- Spread batter evenly into the prepared pan and smooth the top. Bake for 25–30 minutes, rotating halfway, until a toothpick comes out with moist crumbs.
- Let cool completely in the pan on a wire rack before frosting.
- For the frosting, beat softened butter until creamy. Gradually add powdered sugar and mix until smooth, then add vanilla extract. Adjust consistency with heavy cream as needed.
- Spread frosting evenly on the cooled cake and decorate as desired.
Notes
Room-temperature ingredients yield the best texture. Cake pairs well with coffee or fresh berries.
- Prep Time: 20 minutes
- Cook Time: 30 minutes
- Category: Dessert
- Method: Baking
- Cuisine: American