Apple Pancakes with Cinnamon Butter

Name: Apple Pancakes with Cinnamon Butter
Ingredients: 1/2 cup (1 stick) unsalted butter, room temperature; 1/2 cup powdered sugar; 1 teaspoon ground cinnamon; 1 teaspoon grated orange peel; 2 teaspoons fresh lemon juice; 1 teaspoon grated lemon peel; 2 medium Granny Smith apples (scant 1 pound), peeled, halved, cored; 1 2/3 cups all purpose flour; 2 tablespoons (packed) golden brown sugar; 2 1/2 teaspoons baking powder; 1/2 teaspoon salt; 3/4 cup whole milk; 2 large eggs; 1/2 cup (1 stick) unsalted butter, melted, divided