Open each can of cinnamon rolls. Reserve the icing. Cut each rolls into 6 pieces.
Place the granulated sugar and cinnamon in a gallon size ziploc bag. Add the cut up cinnamon rolls (the pieces will fall apart a little) to the bag. Seal and shake to coat the pieces with cinnamon sugar.
Stir together the brown sugar and melted butter.
Spray a 5-7 Qt slow cooker with nonstick cooking spray. I recommend using a slow cooker liner for easy clean-up. If you use the liner you should also spray it with nonstick spray.
Add the coated cinnamon roll pieces to the slow cooker. Pour the brown sugar mixture over the top and stir gently to coat.
Place a paper towel over the insert and then add the lid - this is to keep the condensation that collects on the lid off the rolls.
LOW: Cook on low for about 2 hours. Check it at about 1 ½ hours to make sure it's not getting too done around the edges. It will get dark brown around the edges and look doughy in the center (the pieces will be light, not golden). Once it gets dark around the edges it's done - don't let it burn.
HIGH: Cook on high power for about 1½ hours, but check it after 1 hour. It will be very dark around the edges and somewhat doughy in the center. (We sometimes like it that way!) Once it gets dark around the edges it's done - don't let it burn.
Drizzle the icing that came with the rolls over the top of the monkey bread in the crockpot, or pour it over like syrup after serving.
Not all slow cookers are created equal. Some have hot spots in some areas. If you notice it's browning too much in one area, flip the insert.
The monkey bread will stick as it cools. Serve from the warm slow cooker and make sure that you take it all out before it cools all the way or it’ll require soaking.
Store in an airtight container for up to 3 days.