Gooey Biscoff Crumb Bars

These Biscoff crumb bars are crazy rich but I can’t resist them! A thick and chewy cookie base topped with a layer of melty Biscoff spread, then roasted marshmallows and a crunchy crumb topping with a Biscoff drizzle…holy heaven!

Ingredients

1/2 Cup Butter, unsalted, softened

1/2 Cup Sugar

1/4 Cup Brown Sugar

1 teaspoon Vanilla

1 Egg, plus 1 egg yolk

1 1/2 Cup Flour

3/4 teaspoon Salt

1 teaspoon Baking Powder

3/4 teaspoon Baking Soda

1 1/2 teaspoon Cream of Tartar

1 Tablespoon Cornstarch

1 Cup Biscoff

2-3 Cups Mini Marshmallows

Crumb Topping

3 Tablespoons Brown Sugar

3 Tablespoons Sugar

1/2 Cup Flour

1 teaspoon Cinnamon

1/4 teaspoon Salt

4 Tablespoons Butter, softened