Oatmeal Sandwich Cookies
Preheat the oven to 350°F.
Line a baking sheet with parchment paper.
In a medium bowl, sift together the flour, salt, baking soda, cinnamon and nutmeg.
Using a stand mixer fitted with the paddle, cream together both sugars and butter for about 3 minutes until light and fluffy, scrapping down the sides at least once.
Add eggs, one by one, with about a minute between each.
Add vanilla, continuing to beat on medium.
Add dry ingredients (flour mixture) 1/2 cup at a time on low speed until combined.
Stir in the oats on low, one cup at a time.
Use a medium (2 inch) scoop or make a 2 tbsp ball of oatmeal cookie dough by hand.
Place cookie dough balls at least 2 inches apart on your lined cookie sheet.
Chill cookie dough in the freezer for 5 minutes.
Bake for 13-15 minutes, until edges are golden brown and top is cooked. Insides will still be a soft, chewy oatmeal cookie.
Allow to cool 10 minutes, moving to wire racks to cool after about 2 minutes.
Pipe or spoon marshmallow cream (maple or vanilla) onto bottom of one cookie. Place an equal size cookie on top to create a sandwich cookie.
Maple Marshmallow Creme
Cream together butter and powdered sugar, about 2-3 minutes until light and fluffy.
Add the marshmallow, whipping on medium to medium-high until combined.
Add maple syrup, vanilla, maple extract and pinch of salt.
Add more powdered sugar to thicken or more maple syrup to thin as needed.
Vanilla Marshmallow Creme
Cream together butter and sugar, about 2 minutes until light and fluffy.
Add marshmallow creme (aka Marshmallow fluff), whipping on medium to medium-high until combined.
Add vanilla extract.
Add milk one tablespoon at a time, until your marshmallow creme is a semi-thick frosting consistency. You do not want your creme to dribble out or be too stiff.