Prepare all crispy treat ingredients. I use a rolling pin to crush the Biscoff Cookies into small pieces.
Combine 1 Tb butter and 10 ounces of marshmallows in a large microwave safe bowl.
Microwave uncovered for about 1 minute and 30 seconds or until the marshmallows poof up above the rim of the bowl.
Remove from microwave and stir marshmallows and butter together until incorporated.
Slowly add the puffed rice cereal and the Biscoff Cookie pieces while stirring.
Transfer Crispy Treats to a foil lined and buttered (extra butter) 9×9 baking dish. Firmly press down with buttered hands.
Refrigerate until firm. (approximately 15-30 minutes)
For the glaze, melt 2 Tb butter and combined with the 1/2 cup of Biscoff Spread using a hand mixer or whisk.
Pour over the crispy treats and spread evenly with a spatula. Return to refrigerator for 15 minutes.
Cut your Biscoff Crispy Treats into the desired size using a buttered knife. Enjoy!