Creating a Juicy Blueberry Upside Down Cake is simple, especially when you follow these clear steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Grease a 9-inch round cake pan and line the bottom with parchment paper.
2. Prepare the Blueberries: If using frozen blueberries, thaw and drain them. In the greased pan, sprinkle the brown sugar evenly on the bottom. Pour the melted butter over the sugar.
3. Layer the Blueberries: Arrange the blueberries over the sugar and butter mixture, ensuring even coverage.
4. Mix Dry Ingredients: In a bowl, combine the flour, baking powder, and salt. Whisk together until well mixed.
5. Combine Wet Ingredients: In another bowl, whisk together the granulated sugar, eggs, milk, and vanilla extract until smooth.
6. Combine Mixtures: Gradually add the dry ingredients to the wet ingredients, stirring until just combined and smooth. Avoid over-mixing.
7. Pour Batter: Carefully pour the batter over the blueberries in the cake pan, smoothing it out evenly.
8. Bake the Cake: Bake in the preheated oven for 35-40 minutes or until a toothpick inserted in the center comes out clean.
9. Cool the Cake: Remove the cake from the oven and let it cool in the pan for about 15 minutes. Then, run a knife around the edges to loosen it.
10. Flip the Cake: Place a serving platter on top of the cake and quickly invert it. Gently lift the pan to reveal the gorgeous blueberry layer. Remove the parchment paper.

By following these simple steps, you’ll end up with a stunning and delicious Juicy Blueberry Upside Down Cake that will wow your guests!