Ooey Gooey S’mores Bars

Preheat oven to 350 degrees. Grease 1 (8x8) baking dish with cooking spray and line with parchment paper for easy lifting. Set aside.
Using a food processor (or your method of choice), crush 18 biscoff cookies into fine crumbs. You should end up with 1 heaping cup. Set aside.
Place butter, granulated sugar, and brown sugar into a medium sized bowl.
Beat, using a whisk, hand mixer, or stand mixer, until fluffy, about 2 minutes.
Mix in the egg and vanilla, then fold in the flour, baking powder, and salt using a spatula, hand mixer, or stand mixer.
Stir in the cookie crumbs.
Using greased hands, press half of the dough into the bottom of the pan.
Layer with the chocolate bars, cookie butter, 12-13 biscoff cookies, then marshmallow fluff*.
Scoop remaining dough into cookie dough balls, flatten each piece in your hand, then lay each piece on top of the fluff to create a top crust*.
Bake in preheated oven for 30-35 minutes or until the top is golden brown.
Allow to cool for at least 4 hours before slicing and serving**.
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