
Pumpkin Spice Oatmeal Cream Pies is a fluffy marshmallow filling (from my Oatmeal Cream Pies) sandwiched between two soft, spiced pumpkin oatmeal cookies for a cozy and delicious treat! Yes, these sandwich cookies scream Fall, but I love them any time of the year! Even the pumpkin oatmeal cookies stand on their own as wonderfully delicious cookies year-round!
Preheat oven to 400°F. Line a baking sheet with parchment paper. Set aside.
In a large mixing bowl, whisk together flour, oats, pumpkin pie spice, baking powder, baking soda, salt, and nutmeg.
To the bowl of a stand mixer with the paddle attachment, add butter and brown sugar. Beat on low speed until smooth.
Add eggs, molasses, and vanilla. Mix until all ingredients are fully incorporated, stopping to scrape down the sides of the bowl as needed.
With the mixer still on low speed, slowly add the dry ingredients until fully incorporated.
Using a 2-tablespoon scoop, drop the dough onto the lined baking sheet. Then, gently press to slightly flatten the cookies.
Bake for 7-8 minutes. They may look slightly doughy, and that is okay.
Let the cookies rest on the baking sheet for a couple of minutes before transferring them to a wire rack to cool completely.
While the cookies are cooling, mix together the butter and marshmallow fluff.
Add confectioners' sugar, mixing to combine. The filling will be very stiff.
Spread filling on the bottoms of half the cookies and top with the remaining cookies.