Thoroughly grease the crockpot with butter or shortening.
In a small bowl, melt butter in the microwave and stir vanilla into it.
In another small bowl, combine sugar and cinnamon.
Roll out biscuit dough and cut into biscuits with a biscuit cutter.
Dip biscuits into melted butter mixture, then into cinnamon sugar mixture. Put in crockpot in a single layer.
Cover the crockpot with a tea towel or paper towel (to reduce condensation) and put lid on.
Turn crockpot on low and bake biscuits for 2-3 hours until done.
You can glaze with a powdered sugar & milk glaze, if you’d like. Or you can leave them unglazed like I did. I thought they were plenty sweet without the glaze!