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1
Preheat oven to 350 degrees F. Grease or line 2 6-inch cake pans with parchment paper.
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2
In a large bowl, whisk together milk and vinegar and let it stand for about 5 minutes to make buttermilk.
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3
Add sugar, oil, and vanilla extract, and whisk together until mixture becomes frothy.
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4
Sift together flour, cornstarch, baking soda, baking powder, and salt.
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5
Add dry ingredients to the wet ingredients and whisk together until flour streaks disappears.
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6
Divide batter evenly between pans and bake for 2530 minutes, or until a toothpick inserted into the center of the cake comes out clean.
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7
Cool pans on wire racks for about 15 minutes.
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8
Then turn the cakes out of the pans onto the wire racks and cool completely before frosting.
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9
For the frosting: Using and electric hand mixer, mix butter until it softens and becomes light and fluffy, about 1 minute.
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10
Mix in vanilla and powdered sugar a little at a time until it all comes together and looks like frosting.
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11
To assemble the cake: Place one layer of the cake on a plate and spread about 1/2 cup of frosting on top evenly over the first layer.
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12
Place the second layer on top of the first and do the same with the frosting.
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13
Put a large dollop of frosting on the top of the cake.
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14
Work your way around the sides until the entire cake is covered with an even layer of frosting and top with sprinkles.
