Oatmeal Creme Pies Recipe

Name: Oatmeal Creme Pies Recipe
Ingredients: For Cookies:; 8 ounces all purpose flour; 4 ounces rolled oats; 1/2 ounce cocoa powder; 2 ounces dried apple rings; 3 ounces unsalted butter; 2 1/4 ounces neutral flavored oil, like safflower; 7 ounces sugar; 1 1/2 ounce molasses; 3 ounces corn syrup; 1 1/2 teaspoon baking soda; 1/2 teaspoon baking powder; 1/2 teaspoon salt; 1/4 teaspoon ginger; 1/4 teaspoon cinnamon; 1/4 teaspoon mace; 1 egg; 2 ounces milk; For Marshmallow Filling:; 1 1/2 teaspoons gelatin powder; 2 1/2 ounces water, divided; 1 3/4 ounces corn syrup; 4 1/2 ounces sugar; 1/4 teaspoon salt; 1 teaspoon vanilla extract; 3/4 ounce unsalted butter