Cookie Butter Sandwich Cookies

0 Preheat oven to 325° and line two sheet trays with parchment paper
1 Mix butter and cornstarch together until combined.
2 Add the powdered sugar and then the flour. Stir until completely mixed.
3 Roll into 1 teaspoon balls and place on pan.
4 Bake for 9-11 min or until just lightly brown. Watch closely because they brown quickly towards the end.
5 Press them down slightly as soon as they come out of the oven. You want them to be flat, not puffy.
6 Let cool completely and spread one tablespoon of cookie butter on the bottom side of a cookie. Place another cookie bottom-side down on top of it to form a sandwich.
7 Repeat until all cookies are used.