I got this recipe from here and it's so good I've made it at least once a month since I discovered it. When my family come to visit, they ask for this every time!
1 can biscuits (I use Grands)
1/4c melted butter
1/2c brown sugar
1tsp cinnamon (I add 1/2tsp more)
1 1/2c powdered sugar
Spray your slow cooker with cooking spray and add the vanilla to your melted butter. In a separate bowl, mix brown sugar and cinnamon. Cut the biscuits into quarters. Roll the biscuits in the butter then in the cinnamon mixture, making sure every inch is covered. Place the biscuits in the slow cooker. Cover the slow cooker with a paper towel then place the lid on top. The paper towel catches the condensation and prevents your rolls from getting soggy. ...Ugh, soggy rolls! Gross!
Cook on low for 2 hours. Mix powdered sugar & milk & pour over rolls when done.