Copycat Costco Vanilla Cake

Ah, yes—the famous Costco Vanilla Sheet Cake! Soft, fluffy, ultra-moist, with a sweet, buttery frosting. Here’s a copycat version you can make at home:

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🎂 Copycat Costco Vanilla Cake

Ingredients

Cake:

• 2¾ cups all-purpose flour

• 1 tbsp baking powder

• ½ tsp baking soda

• ½ tsp salt

• 1 cup unsalted butter, softened

• 2 cups granulated sugar

• 4 large eggs

• 1 tbsp vanilla extract

• 1 cup buttermilk

• 1 cup whole milk

Frosting:

• 1 cup unsalted butter, softened

• 4 cups powdered sugar

• ¼ tsp salt

• 1 tbsp vanilla extract

• 4–6 tbsp heavy cream (adjust for desired consistency)

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Instructions

Cake:

1. Preheat oven to 350°F (175°C). Grease and line a 9×13-inch pan with parchment paper.

2. Mix dry ingredients: flour, baking powder, baking soda, and salt. Set aside.

3. Cream butter and sugar until fluffy, about 3–4 minutes.

4. Add eggs one at a time, beating well after each. Mix in vanilla.

5. Alternate adding dry ingredients and milk (start and end with dry), mixing until smooth.

6. Pour batter into prepared pan and smooth the top.

7. Bake 35–40 minutes, or until a toothpick comes out clean. Cool completely.

Frosting:

1. Beat butter until creamy.

2. Gradually add powdered sugar and salt, mixing well.

3. Add vanilla and 4 tbsp cream; beat until fluffy. Add more cream if needed.

4. Frost cooled cake generously. Smooth the top and edges with a spatula.

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🔥 Tips for That Costco Touch

• Use buttermilk: makes the cake tender and moist.

• Beat butter and sugar well: fluffy buttercream is key.

• Room temp ingredients: ensures even mixing and smooth batter.

• Optional decoration: pipe borders or small rosettes with leftover frosting for the classic Costco look.

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If you want, I can also give you a “shortcut version” that uses one bowl and no stand mixer, still tasting like Costco cake but way less effort. Do you want that version too?