Homemade Oatmeal Creme Pie Cookies. Chill the sheet for 30 minutes before baking to ensure. One sheet at a time bake the cookies until lightly golden 10 to 12 minutes.
Beat together butter and sugars with an electric mixer on medium speed until combined. One sheet at a time bake the cookies until lightly golden 10 to 12 minutes. Using a 1 12-tablespoon scoop to portion the dough place the dough balls about 2 inches apart on the baking sheets 10 cookies per sheet.
In a large bowl mix the marshmallow fluff.
Beat on high speed until light and fluffy 2 to 3 minutes. Mix in the oatmeal until just incorporated give it one more scrape and portion with 2-ounce scoops onto a greased cookie sheet. Preheat oven to 375F. Cover the bowl and refrigerate the dough for about 2.