01 - Preheat the oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together the flour, rolled oats, baking soda, and salt until evenly distributed.
03 - In a large bowl, beat the softened butter, Biscoff spread, brown sugar, and granulated sugar using an electric mixer until creamy and smooth, about 2 minutes.
04 - Add the egg and vanilla extract to the butter mixture and mix until fully incorporated.
05 - Gradually stir the dry ingredient mixture into the wet ingredients, mixing just until combined. Do not overmix.
06 - Gently fold in the roughly chopped Lotus Biscoff cookies until evenly distributed throughout the dough.
07 - Scoop tablespoon-sized balls of dough onto the prepared baking sheets, spacing them 2 inches apart to allow for spreading.
08 - Bake for 10 to 12 minutes, until the edges are golden and the centers appear just set.
09 - Allow the cookies to cool on the baking sheets for 5 minutes, then transfer to a wire rack to cool completely.