Peppermint Oreos

Hello there! I hope everyone had a lovely Christmas :)
These cookies are a holiday version of my beloved homemade oreos. Just because Christmas is over doesn't mean you can't enjoy peppermint!
They're great if you're looking to make something easy that will wow the masses at your New Year's Eve gathering.
Homemade Oreos with Peppermint Creme Filling
Adapted from Smitten Kitchen
Yield: ~20 sandwich cookies
Ingredients:
Flour- 1 1/4 c
Unsweetened Dutch process cocoa- 1/2 c
Baking soda- 1 tsp
Baking powder- 1/4 tsp
Salt- 1/4 tsp
Sugar- 1 to 1 1/2 c (use less if you don't want the cookies to be super sweet)
Unsalted butter- 1/2 c plus 2 tbsp (1 1/4 sticks), room temperature
1 large egg
{Creme filling}
Unsalted butter- 1/4 c (1/2 stick)
Vegetable shortening (Crisco)- 1/4 c
Sifted powdered sugar- 2 c
Peppermint extract- 2 tsp
Directions:
1. Preheat oven to 375 degrees F.
2. In a food processor, or in the bowl of an electric mixer, combine flour, cocoa, baking soda, baking powder, salt and sugar. Process/beat, make sure it's combined well!
3. With the mixer running, add the butter, then the egg. Continue beating/processing until the dough forms a mass.
4. Take rounded teaspoons of the batter and place on a parchment paper-lined baking sheet, approx. 2 inches apart. With moistened hands, lightly press the dough to flatten.
5. Bake for 8-9 minutes (8 if you want them a little soft/chewy), rotating pans once for evenness. Set on baking rack to cool completely.
6. {For the creme filling} Beat butter and shortening in a mixing bowl until combined. Add powdered sugar gradually, then add peppermint. Turn mixer on high and beat for 2 minutes.
7. Place creme filling in a pastry bag fitted with a jumbo pastry tip. Pipe onto half of the cooled cookies, then sandwich them with their matches. Serve with a glass of milk!!!

Enjoy!