01 - Preheat oven to 350°F. Line two baking sheets with parchment paper and set aside.
02 - In a medium bowl, whisk together the rolled oats, all-purpose flour, baking soda, salt, and ground cinnamon until evenly distributed. Set aside.
03 - In a large bowl, beat the softened butter, Biscoff spread, light brown sugar, and granulated sugar using an electric mixer until the mixture is light and fluffy, approximately 2–3 minutes.
04 - Add the egg and vanilla extract to the creamed mixture, beating until fully combined and smooth.
05 - Gradually stir the dry ingredient mixture into the wet ingredients, mixing until just incorporated. Avoid overmixing to maintain a tender texture.
06 - Gently fold the roughly chopped Lotus Biscoff cookies into the dough, distributing the pieces evenly throughout.
07 - Scoop approximately 2 tablespoons of dough per cookie onto the prepared baking sheets, spacing them about 2 inches apart to allow for spreading. Optionally, press additional Biscoff cookie pieces onto the tops for decoration.
08 - Bake for 10 to 12 minutes, until the edges are golden brown and the centers remain slightly soft. Avoid overbaking for the best chewy texture.
09 - Allow the cookies to cool on the baking sheets for 5 minutes to set, then transfer to a wire rack to cool completely before serving or storing.