Biscoff Cookie Butter White Chocolate Chip Cookies

1 Preheat oven to 350°F (175°C) and line baking sheets with parchment paper.
2 In a large bowl, cream together butter, Biscoff cookie butter, brown sugar, and granulated sugar until smooth and fluffy, about 2 minutes.
3 Mix in the egg, egg yolk, and vanilla until fully combined.
4 In a separate bowl, whisk together flour, baking soda, and salt.
5 Add dry ingredients to wet ingredients and mix until just combined.
6 Fold in white chocolate chips and crushed Biscoff cookies (if using).
7 Chill dough for 30 minutes for thicker cookies.
8 Scoop dough into 2-tablespoon balls and place 2–3 inches apart on baking sheets.
9 Bake for 10–12 minutes, until edges are set and centers look slightly underbaked.
10 Cool on the pan for 5 minutes, then transfer to a wire rack.