Thaw frozen dinner rolls on a greased baking sheet, covered with sprayed plastic wrap, for 1-2 hours at room temperature or overnight in the fridge. They should be cold and slightly risen. Then, cut eat roll into four pieces.
In a large bowl, combine sugar and cinnamon. Mix until well combined.
Spray a 6-quart slow cooker with non-stick cooking spray. Then, coat the dough in the cinnamon and sugar mixture and place in the slow cooker.
In a small bowl, combine melted butter, brown sugar, nutmeg, and vanilla extract. Mix until well combined and pour over the dough.
Cook on high for 1½ hours or until no longer doughy in the center.
In a small bowl, combine powdered sugar, milk, and vanilla extract. Mix until well combined and pour over monkey bread before serving.
Notes
When you thaw the rolls, make sure they're pliable but still cold.
Thoroughly coat each dough piece in the cinnamon sugar.
Insert a knife or toothpick into the center to check if it's done. It should come out clean.
Allow the monkey bread to cool for 5 minutes before you add the icing on top.