Recipe for Inverted Caramelized Apple Muffins recipes

Name: Recipe for Inverted Caramelized Apple Muffins recipes
Ingredients: 3 tablespoons butter; 1/3 cup sugar; 2 medium golden delicious apples, cored but peels intact, cut in small dice (about 2-3/4 cups); 6 tablespoons butter; 1-1/4 cups all-purpose flour; 3/4 cup whole wheat pastry flour; 2 teaspoons baking powder; 1/2 teaspoon baking soda; 3/4 teaspoon cinnamon; 3/4 teaspoon kosher salt; 1 cup old-fashioned rolled oats; 1-1/4 cups yogurt or buttermilk, or a combination; 2 eggs; 2/3 cup sugar; 1 teaspoon vanilla