Preheat oven to 375℉.
Using a food processor (or a ziploc bag and a rolling pin), process cookies until finely ground. Set aside.
12 Lotus Biscoff cookies, processed to finely ground crumbs
In a large mixing bowl, cream together butter, cookie butter spread, granulated white sugar, and brown sugar for several minutes. The color should become quite pale.
⅔ cup salted butter, softened to room temperature, ¾ cup Biscoff Cookie Butter (creamy), ¾ cup granulated sugar, ¼ cup light brown sugar, packed
Next, add in the egg, milk, and vanilla extract, and again mix well.
1 large egg, at room temperature, 2 tablespoons milk, 1 ½ teaspoons vanilla extract
In a separate bowl, stir together the dry ingredients of flour, cornstarch, baking soda, salt, and finely ground cookie crumbs.
2 cups all purpose flour, 1 tablespoon cornstarch, 1 teaspoon baking soda, 1 teaspoon salt, 12 Lotus Biscoff cookies, processed to finely ground crumbs
Add dry to wet ingredients and mix until all ingredients are combined.
Finally, if using, stir in chocolate chips.
1 cup chocolate chips (optional)
Scoop out heaping teaspoonfuls of cookie dough and place on a lined baking sheet.
Bake on the middle rack of the oven for 10-12 minutes.
Place the baked cookies on a cooling rack for a few minutes and then enjoy!