I added sour cream to my yellow cake mix instead of oil. 45 minutes later, this is what happened

like sour cream, it won’t. What it did was round out the sweetness and give the cake a deeper flavor.

That was especially noticeable once I added a simple vanilla buttercream made with 1/2 cup butter, 3 cups powdered sugar, 2 tablespoons milk, and 1 teaspoon vanilla extract. The frosting tasted sweeter against the slightly richer cake, which made the whole dessert feel more polished.

Vanilla buttercream being spread over yellow sheet cake
Vanilla buttercream being spread over yellow sheet cake
8. It worked especially well for a sheet