2 large Granny Smith apples, peeled, cored, and sliced into 1/4 inch wedges
1/2 cup unsalted butter, melted (for the topping)
3/4 cup light brown sugar, packed
1 teaspoon ground cinnamon
1 1/2 cups all-purpose flour
1 1/2 teaspoons baking powder
1/4 teaspoon salt
1/2 cup unsalted butter, softened (for the cake)
3/4 cup granulated sugar
2 large eggs, room temperature
1 teaspoon vanilla extract
1/2 cup whole milk
Instructions
Preheat your oven to 350°F (175°C). Generously grease a 9-inch round cake pan with butter or non-stick cooking spray to ensure the caramel doesn’t stick to the sides.
Pour the 1/2 cup of melted butter into the bottom of the prepared cake pan. Evenly sprinkle the brown sugar and cinnamon over the butter. Use a spatula to spread it into an even layer.
Carefully arrange the apple slices in a circular pattern on top of the sugar mixture. You can overlap them slightly to create a beautiful shingled effect that will show once the cake is flipped.
In a medium-sized bowl, whisk together the all-purpose flour, baking powder, and salt. Set this mixture aside for later use.
In a large mixing bowl, cream the softened butter and granulated sugar together until light and fluffy. Add the eggs one at a time, beating well after each addition, then stir in the vanilla extract.
Gradually add the dry ingredients to the wet ingredients, alternating with the milk. Start and end with the flour mixture. Mix until just combined, being careful not to overwork the batter.
Carefully spread the batter over the apple slices in the pan, smoothing the top with a spatula. Bake for 40 to 45 minutes, or until a toothpick inserted into the center comes out clean.
Allow the cake to cool in the pan for exactly 10 minutes. Run a knife around the edges, place a serving plate upside down over the pan, and quickly flip it over. Let it sit for a moment so the caramel drips down before lifting the pan off.