1. Prepare the Crust:

1. Preheat oven to 350°F (175°C). Pour melted butter into a 9-inch round cake pan and sprinkle brown sugar evenly over the butter.
2. Arrange pineapple slices on top of the sugar mixture. Place a cherry in the center of each pineapple slice and between slices as desired.
3. In a medium bowl, whisk together flour, baking powder, and salt. In a separate large bowl, beat softened butter and granulated sugar until light and fluffy.
4. Add eggs one at a time to the butter mixture, beating well after each addition. Stir in vanilla extract.
5. Alternately add the flour mixture and milk to the butter mixture, beginning and ending with the flour mixture. Mix until just combined.
6. Spread batter evenly over the pineapple layer in the cake pan. Bake for 30-35 minutes or until a toothpick inserted into the center comes out clean.
7. Cool cake in pan for 10 minutes, then invert onto a serving plate. Serve warm or at room temperature.