Baked Red Velvet Doughnuts

Ingredients

• 1 cup all-purpose flour
• ¾ tsp baking powder
• ¾ tsp baking soda
• ½ tsp salt
• ⅓ cup granulated sugar
• 1 large egg
• ⅓ cup + 1 T buttermilk
• 3 T cocoa poder
• 3 T melted unsalted butter
• 1 tsp white vinegar
• 1 tsp vanilla extract
• 1 T sour cream
• red food coloring
• 3 T softened cream cheese
• ½ cup sifted powdered sugar
• ¼ tsp vanilla extract
• 3 T heavy cream