Cream together the butter and brown sugar together until light and fluffy. Beat in the egg, then add 1/4 cup water and vanilla and blend to mix.
Combine the 3 cups oatmeal, the flour, and baking powder together. Add these dry ingredients to the butter mixture and blend well.
Drop by small teaspoons ( I used my small scoop and broke them in half ), roll then pat to flatten each cookie before baking.
Bake for about 12-14 minutes or until just lightly golden on the sides of the cookie.
Move to a wire rack and cool completely. To assembly, spread the desired amount of Biscoff on the bottom of one cookie and push another cookie on top to make the sandwich.
Recipe by Just a Smidgen at https://justasmidgen.com/2012/11/30/vintage-christmas-wreath-biscoffie-bites/