Ingredients
2 ½ cups all-purpose flour
1 ½ cups granulated sugar
1 teaspoon baking soda
1 teaspoon cocoa powder
½ teaspoon salt
1 cup buttermilk, room temperature
½ cup vegetable oil
2 large eggs, room temperature
1 tablespoon white vinegar
2 teaspoons vanilla extract
2 tablespoons blue food coloring (or natural blue alternatives)
For the Cream Cheese Frosting:
8 oz cream cheese, softened
½ cup unsalted butter, softened
4 cups powdered sugar
1 teaspoon vanilla extract
Instructions
Step 1: Preheat oven to 350°F (175°C). Grease and flour two 9-inch round cake pans.
Step 2: In a large bowl, sift together flour, sugar, baking soda, cocoa powder, and salt.
Step 3: In another bowl, whisk buttermilk, oil, eggs, vinegar, vanilla, and blue food coloring until well combined.
Step 4: Gradually add the wet ingredients to the dry, mixing until smooth and combined.
Step 5: Divide batter evenly into prepared pans and bake for 25-30 minutes or until a toothpick inserted in the center comes out clean.
Step 6: Remove cakes from oven, cool in pans for 10 minutes, then transfer to wire racks to cool completely.
Step 7: For frosting, beat cream cheese and butter until creamy. Add powdered sugar gradually and beat until fluffy. Mix in vanilla extract.
Step 8: Once cakes are fully cool, frost the layers evenly, stacking one on top of the other. Frost the outside of the cake as desired.
Notes
For a natural blue color, try using butterfly pea flower powder or spirulina powder instead of artificial dyes.
Make sure all wet ingredients are at room temperature to ensure proper mixing.
To prevent the cake from turning green, avoid overmixing the batter after adding food coloring.
- Prep Time: 20 minutes
- Cook Time: 30 minutes
- Category: Dessert
- Method: Baking
- Cuisine: American
Nutrition
- Serving Size: 1 slice (about 1/12th of the cake)
- Calories: 320
- Sugar: 28g
- Sodium: 200mg
- Fat: 18g
- Saturated Fat: 9g
- Unsaturated Fat: 7g
- Trans Fat: 0g
- Carbohydrates: 35g
- Fiber: 1g
- Protein: 4g
- Cholesterol: 55mg