Easy 15 minutes Chocolate Donuts

Ingredients

• 1 cup flour
• 1/2 cup sugar
• 1/4 cup cocoa powder
• 1/4 cup mini chocolate chips optional
• 1/2 teaspoon baking soda
• 1/4 teaspoon salt
• 1/2 teaspoon vanilla extract
• 1 large egg
• 6 tablespoons sour cream
• 1/4 cup milk
• 1/4 cup vegetable oil
• 1 1/2 cups powdered sugar
• 1/4 cup milk
• 1 teaspoon vanilla