Oatmeal Sandwich Cookies Recipe

Ingredients

• 1 cup shortening
• 2-2/3 cups packed brown sugar
• 4 large eggs, room temperature
• 2 teaspoons vanilla extract
• 2-1/2 cups all-purpose flour
• 2 teaspoons ground cinnamon
• 1-1/2 teaspoons baking soda
• 1 teaspoon salt
• 1/2 teaspoon ground nutmeg
• 4 cups old-fashioned oats
• FILLING:
• 3/4 cup shortening
• 3 cups confectioners' sugar
• 1 jar (7 ounces) marshmallow creme
• 1 to 3 tablespoons 2% milk