1 teaspoon baking powder
2/3 cup Brown Sugar, firmly packed
1/4 cup butter (½ stick), melted
1/2 cup butter (1 stick), softened
1/2 tsp Cinnamon
2 eggs, large
1 1/3 cups all-purpose flour
2/3 cup Granulated Sugar
4 mangos, peeled, pitted and sliced; divided
1/2 teaspoon salt
1 teaspoon vanilla