Cinnamon Sugar – 1½ teaspoons cinnamon – ⅓ cup brown sugar packed, light or dark Apple Filling – 2 cups apples about 2-3 medium apples, peeled, cored, and diced in small cubes, use Granny Smith and/or Honeycrisp or any baking apple – 1 tablespoon granulated sugar – 1 teaspoon cinnamon – ¼ teaspoon ginger optional BREAD – ½ cup unsalted butter room temperature – ¾ cup granulated sugar – 2 large eggs room temperature – 1½ teaspoons vanilla extract – 1½ cups all purpose flour – 2 teaspoons baking powder – ¼ teaspoon baking soda – ½ teaspoon salt – ¼ cup whole milk room temperature – ⅓ cup full fat sour cream room temperature Icing – ¾ cup powdered sugar – 1½ tablespoon milk or heavy cream plus more if icing is too thick – 1/4 teaspoon vanilla extract