In a large bowl, mix the blueberries with the brown sugar, corn starch and cinnamon powder.
Take the rolls out of the package and quarter them - then put them into a bowl.
Place the blueberry mixture in a large casserole dish (slow cooker) and spread the bread rolls on top. Put the lid on and leave in the oven at low heat until the rolls are brown. To serve, simply place part of the mixture in a small bowl and place a scoop of vanilla ice cream on top.