Sour Cherry Coffee Cake

Name: Sour Cherry Coffee Cake
Ingredients: 2 oz unsalted butter, melted, plus more for dish(4 tablespoons), for the topping; 3/4 cup all-purpose flour, plus more for dish, for the topping; 1/4 cup granulated sugar, for the topping; 1/4 cup packed light brown sugar, for the topping; 1/4 tsp Kosher Salt, for the topping; 1/4 tsp Ground cinnamon, for the topping; 1 1/2 cup all-purpose flour,for the cake; 1 tsp Baking Powder,for the cake; 1/4 tsp Kosher Salt,for the cake; 4 oz unsalted butter (1 stick), softened,for the cake; 3/4 cup Granulated Sugar,for the cake; 2 x eggs large,for the cake; 1 tsp Vanilla Extract,for the cake; 1/4 cup Buttermilk,for the cake; 2 cup sour cherries, pitted,for the cake