Baked Chocolate-Coffee Donuts

Ingredients (10)

• + 1 teaspoon unsalted butter add to pantry
• + 1 cup all-purpose flour add to pantry
• + ¼ cup unsweetened cocoa powder add to pantry
• + 1 teaspoon baking powder add to pantry
• + ½ cup packed brown sugar add to pantry
• + ¼ cup buttermilk add to pantry
• + ¼ cup strong brewed coffee add to pantry
• ✓ 1 egg
• + ½ teaspoon vanilla extract add to pantry
• ✓ ¼ cup chocolate chips, or to taste