Ingredients
Method
Donuts
Prepare Pan and Oven:
Grease a nonstick donut pan lightly with butter or spray; set aside. Heat oven to 350°F (175°C).Mix Dry Ingredients:
In a bowl, combine flour, cinnamon, baking powder, baking soda, and salt with a whisk.Whisk Wet Ingredients:
In another bowl, whisk buttermilk, melted butter, mashed banana, granulated sugar, ¼ cup brown sugar, sour cream, oil, and 2 tsp vanilla.Combine Wet and Dry:
Fold wet mixture into dry mixture until no streaks remain.Fill Donut Pan:
Transfer batter to a piping bag and fill the donut pan.Bake Donuts:
Place pan on the center rack and bake for 11-12 minutes, until tops bounce back when pressed.Cool and Remove Donuts:
Cool the pan on a wire rack, then invert and carefully remove donuts.
Glaze
Make Brown Sugar Glaze:
For the glaze: In a saucepan, heat 4 tbsp butter and ½ cup brown sugar until smooth. Stir in milk and bring to a simmer. Take off heat, whisk in powdered sugar and 2 tsp vanilla until smooth. Pour into a bowl and let rest for 10-12 minutes. Glaze will be thin but thickens as it cools.
Caramelized Bananas
Caramelize Bananas:
For caramelized bananas: In a saucepan over medium heat, melt ½ tbsp butter. Sprinkle 2 tbsp brown sugar and ¼ tsp cinnamon over the butter, then add banana slices. After 2 minutes, flip gently and cook for 1 more minute.Glaze Donuts:
Dip donut tops into the glaze. If glaze drips off quickly, let it cool longer. If too thick, warm in a microwave in 10-15 second bursts until desired consistency.Top with Bananas:
Place caramelized banana slices in the center of each donut and serve.
