Preheat oven to 350F. Line a cupcake pan with cupcake liners. In a bowl, melt the butter. Add in the sugar, applesauce, & milk, then stir. Add in baking powder, almond flour, & all purpose flour. Stir until a batter forms & set aside. For the crumble: combine softened butter & sugar. Add in oats, cinnamon, & flour, then stir until crumble forms. Fill the liners halfway with batter, then add a layer of cinnamon sugar, another layer of batter, & top with crumble. Repeat until all batter is used. Bake for about 25 minutes. For the glaze: combine 1 cup powdered sugar, 2-4 tablespoons milk, and 2 teaspoons cinnamon. Make sure muffins are completely cooled before adding the glaze.
