Ingredients:

For the Topping:

• 4-5 medium-sized apples, peeled, cored, and sliced
• 1/2 cup unsalted butter
• 1 cup brown sugar
• 1 teaspoon ground cinnamon

For the Cake Batter:

• 1 and 1/2 cups all-purpose flour
• 1 and 1/2 teaspoons baking powder
• 1/2 teaspoon baking soda
• 1/2 teaspoon salt
• 1 teaspoon ground cinnamon
• 1/2 cup unsalted butter, softened
• 3/4 cup granulated sugar
• 2 large eggs
• 1 teaspoon vanilla extract
• 1 cup buttermilk

Instructions:

1. Preheat the Oven: Preheat your oven to 350°F (180°C). Grease a round cake pan with butter and line the bottom with parchment paper.

2. Prepare the Topping:
   • In a saucepan, melt 1/2 cup of butter over medium heat.
   • Add brown sugar and cinnamon to the melted butter, stirring until the sugar is dissolved.
   • Pour the mixture into the prepared cake pan, spreading it evenly.
   • Arrange the sliced apples over the caramel mixture.
3. 
   
   Prepare the Cake Batter:
   • In a medium bowl, whisk together the flour, baking powder, baking soda, salt, and cinnamon. Set aside.
   • In a large bowl, cream together the softened butter and granulated sugar until light and fluffy.
   • Add the eggs, one at a time, beating well after each addition. Stir in the vanilla extract.
   • Gradually add the dry ingredients to the wet ingredients, alternating with the buttermilk. Begin and end with the dry ingredients, mixing just until combined.
4. Assemble the Cake:
   • Pour the batter over the arranged apples in the cake pan, spreading it evenly.
5. Bake:
   • Bake in the preheated oven for 45-55 minutes or until a toothpick inserted into the center comes out clean.
6. Cooling and Inverting:
   • Allow the cake to cool in the pan for about 10-15 minutes.
   • Place a serving plate upside down over the cake pan and, using oven mitts, carefully invert the cake onto the plate. Be cautious as the caramel may still be hot.
7. 
   
   Serve:
   • Allow the inverted apple cake to cool completely before serving.
8. Optional:
   • You can dust the top with powdered sugar or serve with a dollop of whipped cream or a scoop of vanilla ice cream.

Enjoy your delicious inverted apple cake!