Go Back
–+ servings

Banana Blueberry Upside Down Cake

5 from 1 vote
Moist banana hazelnut cake baked on top of a thick layer of fresh blueberries.
Print Recipe Pin Recipe
Prep Time20 minutes
Cook Time40 minutes
Total Time1 hour
Servings8 slices

Ingredients 

Blueberry Layer

Banana Cake

  • 70 g unsalted butter (5 tbsp.)
  • 160 g banana mashed (~2 medium bananas)
  • 100 g light brown sugar (½ c.)
  • 1 egg room temperature
  • 1 tsp. vanilla
  • 45 g kefir (3 tbsp.) room temperature
  • 120 g all purpose flour (1 c.)
  • 1 ¼ tsp. baking powder
  • ¼ tsp. salt
  • ½ tsp. ground cinnamon
  • 60 g hazelnuts blanched, crushed (¼ c. + 3 tbsp.)

Instructions 

Blueberry Layer

  • Preheat the oven to 350°F / 175°C. Butter a 7” springform pan, and get out a sheet of parchment paper. Crinkle up the parchment paper, then un-crinkle it and place it in your buttered pan, pressing the parchment up the sides of the pan.
  • In a mixing bowl, gently mix together the blueberries and brown sugar. Pour the blueberry mixture into the bottom of your lined pan, forming an even layer of blueberries. Set aside.

Banana Cake

  • In a small microwave safe bowl, melt the butter in 20 second intervals, stirring after each interval until it's just completely melted.
  • In a medium sized mixing bowl, mash up the banana until only a few small chunks remain.
  • To the banana, mix in the melted butter and brown sugar.
  • Add in the egg, vanilla, and kefir. Whisk vigorously until the mixture is well combined.
  • Add in the flour, baking powder, salt, and cinnamon. Gently mix the ingredients together until only a few streaks of flour remain. Then, add in the hazelnuts and mix just until the last streak of flour disappears.
  • Pour the banana cake over the layer of blueberries. Bake for 40-45 minutes, or until a toothpick inserted in the center of the cake comes out clean.
  • Allow the cake to rest in the pan for 30 minutes after baking, then flip it over on to a cooling rack and let it rest until it comes to room temperature.
  • Slice, serve, and enjoy!

Notes

It's important to let the cake rest in the pan after baking. If you flip over the cake too soon, the blueberry layer will start to fall down the sides. 
Affiliate links: 7-Inch Springform Pan | Kitchen Scale (my favorite) | Kitchen scale (great starter option) | Food Processor | Cookie Scoops | Oven Thermometer | Cordless Hand Mixer | Stand Mixer | Food Thermometer