Preheat the oven to 350°F. Line 2 large baking sheets with parchment paper.
In the bowl of a stand mixer, or in a bowl with an electric hand mixer, add the butter and cookie butter and beat for 1-2 minutes, until combined. Add the granulated sugar and brown sugar and beat on medium-high speed, 2-3 minutes. Add the egg, egg yolk, and vanilla and beat until light and fluffy, 1-2 minutes.
1/2 cup unsalted butter, 3/4 cup Biscoff cookie butter, 1/4 cup granulated sugar, 3/4 cup light brown sugar, 1 egg +1 egg yolk, 2 teaspoons vanilla extract
In a separate medium bowl, whisk together the flour, baking soda and salt. Add the dry ingredients to the dough and beat until just combined, scraping down the bottom and sides of the bowl as needed. Add the white chocolate and stir to combine. The dough will be slightly sticky.
2 1/4 cups all purpose flour, 1 teaspoon baking soda, 1/2 teaspoon salt, 4 ounces white chocolate
Use a medium cookie scoop to scoop the cookie dough and drop them 2-3 inches apart on the prepared baking sheet.
Bake for 8-10 minutes, until the tops are just set and the edges are lightly golden. If they spread unevenly, swirl a wide-rimmed cup or biscuit cutter around the edges to form a clean circle. Allow them to cool for 5-10 minutes on the baking sheet then transfer to a wire rack to cool completely.
While they’re cooling, melt white chocolate in the microwave and drizzle it over the cookies. Melt the cookie butter in a separate bowl and drizzle it the opposite direction of the white chocolate. Sprinkle half the cookie with crushed Biscoff cookies.
6 Biscoff cookies