35min · 10 servings NGREDIENTS For The Muffins 1/2 cup unsalted butter, melted 1 cup granulated sugar 2 eggs, room temperature 1/2 cup sour cream 1/4 cup buttermilk 2 teaspoons vanilla extract 2 cups all purpose flour 1 Tablespoon baking powder 1/2 teaspoon salt For The Cinnamon Sugar Swirls 1/2 cup brown sugar 2 teaspoons ground cinnamon pinch of salt For The Buttery Crumb Topping 1/3 cup brown sugar 3/4 cup all purpose flour 2 teaspoons ground cinnamon 6 Tablespoons butter, melted For The Glaze 1 1/2 cups powdered sugar 1 teaspoon vanilla extract pinch of salt 2–3 Tablespoons milk INSTRUCTIONS https://bromabakery.com/coffee-cake-muffins/