01 - Preheat the oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together the all-purpose flour, rolled oats, baking soda, and salt until evenly distributed.
03 - In a large bowl, beat the softened butter, Biscoff spread, light 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 on medium speed until fully incorporated.
05 - Gradually add the dry ingredient mixture to the wet ingredients, stirring gently with a spatula or mixing on low speed just until combined. Do not over-mix.
06 - Fold the roughly chopped Lotus Biscoff cookies into the dough, distributing them evenly throughout.
07 - Scoop tablespoon-sized portions of dough and roll into balls. Arrange on the prepared baking sheets, spacing them 2 inches apart to allow for spreading.
08 - Bake for 10 to 12 minutes, until the edges are lightly golden and the centers appear just set.
09 - Let the cookies rest on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely.