Gluten-Free Oatmeal-Cranberry-Cookie Cupcakes with Buttery Cinnamon Vanilla Frosting

Name: Gluten-Free Oatmeal-Cranberry-Cookie Cupcakes with Buttery Cinnamon Vanilla Frosting
Total time: 35 min
Yield: 4 servings
Ingredients: 3/4 cup butter 1 1/2 sticks; 3/4 cup brown sugar; 3/4 cup white sugar; 1 cup milk; 2 cups rolled oats; 1 cup rice flour; 1/2 cup tapioca starch; 1/2 cup potato starch NOT flour; 2 teaspoons baking powder; 1/2 teaspoon baking soda; 2 teaspoons xantham gum; 1 teaspoon salt; 1 teaspoon cinnamon; 1 cup dried cranberries aka craisins; 1 1/2 cups butter 3 sticks, softened; 3 3/4 cups powdered sugar; 2 1/2 teaspoons cinnamon; 2 teaspoons vanilla