Preheat the oven to 350°F (175°C).
In a large mixing bowl, combine Biscoff cookie butter, brown sugar, and granulated sugar until well blended.
Add the egg and vanilla extract to the mixture, and blend well.
In a separate bowl, whisk together the rolled oats, flour, baking soda, and salt.
Gradually add the dry ingredients to the wet mixture, mixing until just combined.
Drop spoonfuls of dough onto a lined baking sheet, spacing them about 2 inches apart.
Bake in the preheated oven for 10-12 minutes, until the edges are lightly golden.
Allow the cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.
