Preheat oven to 350F. Spray a 9- or 10-inch pie plate or baking dish with cooking spray; set aside.
Open your rolls (I used Big and Flaky Pillsbury Rolls) and carefully unwrap the dough. As you unroll the dough, try to keep it together and do not separate at the perforations. On a clean work surface, spread out dough in one long row (makes a tall rectangle). Press the seams together, overlapping them to close any gaps. Generously spread Nutella over the entire surface, leaving ½-inch margins around all borders. Sprinkle how much cinnamon. you would like.
Begin with a short side and tightly roll up the dough into a log. With a sharp serrated knife, slice into 8 equal-sized pieces. Place pieces in prepared pan with ½-1" space in between each roll. Bake for 12 to 15 minutes. 13 minutes did it for us. Baked but still gooey and delicious!
Right before rolls come out of the oven, make your glaze. Whisk together all ingredients in a small bowl until smooth. You might need to play around with cream and sugar ratios until desired consistency is reached. As soon as you remove your rolls from the oven, pour your glaze and enjoy them chocolaty and oh so gooey.