Glazed Pineapple Upside-Down Cake 
For the Topping:
1/2 cup unsalted butter
1 cup brown sugar, packed
1 can (20 oz) pineapple rings, drained
Maraschino cherries (optional)
For the Cake:
1 1/2 cups all-purpose flour
1 cup granulated sugar
1 1/2 teaspoons baking powder
1/2 teaspoon salt
1/2 cup unsalted butter, softened
2 large eggs
1 teaspoon vanilla extract
1/2 cup milk