Spray inside of the slow cooker with non-stick spray.
Melt butter in a small microwave-safe. Set aside.
Combine the white sugar, brown sugar, and cinnamon in a large (gallon size) plastic bag. Close the bag and shake to combine the sugars and cinnamon. Set aside.
Cut each biscuit into 6 pieces.
Dip each biscuit piece, one at a time, into the melted butter. Place each butter coated biscuit piece into the bag of cinnamon sugar mixture. (You should have leftover butter in the bowl.)
Once all pieces have been added to the bag of cinnamon sugar mixture, close and shake until each and every biscuit piece is completely coated wth the cinnamon sugar mixture.
Pour the leftover butter into the bottom of the slow cooker. Spread the butter to cover the bottom evenly.
Place all the cinnamon sugar coated biscuit pieces evenly into one layer in the slow cooker.
Cook on low for 2 1/2 hours or until fully cooked through.