Red Velvet Star Cakes

Ingredients

• non-stick cooking spray
• 2 1/2 cup all-purpose flour
• 1 1/2 cup sugar
• 1 teaspoon baking soda
• 1 teaspoon salt
• 1 teaspoon cocoa powder
• 1 1/2 cup vegetable oil
• 1 cup room temperature buttermilk
• 2 room temperature eggs
• a few drops of red food coloring
• 1 teaspoon distilled white vinegar
• 1 teaspoon vanilla extract
• 1 8-ounce package cream cheese, softened
• 1 stick butter, unsalted and softened
• 2 cups confectioner's sugar
• 1/2 teaspoon vanilla extract
• bluberries