01 - Preheat oven to 350°F (175°C). Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together the rolled oats, all-purpose flour, baking soda, salt, and ground cinnamon. Set aside.
03 - In a large bowl, beat the softened butter, Biscoff spread, light brown sugar, and granulated sugar using an electric mixer or whisk until light and fluffy.
04 - Mix in the egg and vanilla extract until well combined.
05 - Stir in the dry ingredient mixture until just incorporated. Do not overmix.
06 - Fold in the chopped Lotus Biscoff cookies until evenly distributed throughout the dough.
07 - Scoop dough in 2-tablespoon portions onto prepared baking sheets, spacing about 2 inches apart. Optionally, press extra Biscoff cookie pieces on top of each portion.
08 - Bake for 10–12 minutes, until edges are golden and centers are still slightly soft.
09 - Allow cookies to cool on the baking sheets for 5 minutes, then transfer to a wire rack to cool completely.