Making your own Juicy Blueberry Upside Down Cake is straightforward if you follow these simple steps:

1. Preheat your oven to 350°F (175°C) and thoroughly grease a 9-inch round cake pan with cooking spray.
2. Prepare Topping: In a small bowl, mix ¼ cup of granulated sugar with the melted butter. Pour this mixture into the bottom of the prepared cake pan.
3. Add Blueberries: Evenly distribute the fresh blueberries over the sugar and butter mixture in the pan.
4. Mix Dry Ingredients: In a medium bowl, whisk together the flour, baking powder, baking soda, and salt.
5. Whisk Wet Ingredients: In a large mixing bowl, beat the remaining ½ cup of sugar with the buttermilk, eggs, and vanilla extract until smooth.
6. Combine Mixtures: Gradually add the dry ingredients to the wet mixture, stirring until just combined and smooth. Be careful not to overmix.
7. Pour Batter: Gently pour the batter over the blueberries in the prepared pan, smoothing it out evenly.
8. Bake: Place the cake in the preheated oven and bake for 35-40 minutes, or until a toothpick inserted in the center comes out clean.
9. Cool: Once done, remove the cake from the oven and allow it to cool in the pan for about 15-20 minutes.
10. Invert and Serve: Carefully invert the cake onto a serving plate, letting the blueberry topping cascade down. Allow it to cool slightly before slicing.

By following these steps, you’ll create a beautiful and delicious Juicy Blueberry Upside Down Cake that is both inviting and mouthwatering.