Preheat oven to 325°F. Line a cookie sheet with parchment paper.
Melt the butter and let cool for 15 minutes.
1/2 cup butter
In a large bowl, whisk melted butter, brown sugar, and sugar.
2/3 cups light brown sugar, 2 tbsp white sugar
Add in approximately 3 tbsp of cookie butter and whisk. Add in vanilla and egg. Whisk until smooth.
2 egg yolks, 2 tbsp vanilla, 1/2 cup Biscoff cookie butter
Add in flour, baking soda, and salt. Use a rubber spatula and fold the dough until just combined. Do not over mix! Add in mini chocolate chips and cookie crumbs and fold into the dough.
1 1/3 cups all-purpose flour, 1/2 tsp baking soda, 1/2 tsp salt, 1/2 cup mini chocolate chips, 3 Biscoff cookies
Scoop 6 cookie dough balls and place on the prepared cookie sheet.
Bake for 13-16 minutes. Mine took 16 minutes. The cookies will be ready when the edges are a golden brown, but the inside will look very soft. Remove from oven. Top with 1/4 tsp dollops of cookie butter and mini chocolate chips if desired.
Let the cookies cool on the hot pan for a few minutes before serving warm or cool completely and enjoy!