Preheat the oven to 375º Fahrenheit. Spray an 8" round cake pan or pie plate with cooking spray.
In a medium bowl, mix together the baking mix and buttermilk to form a dough.
Sprinkle flour on a pastry mat or on the counter.
Using a rolling pin, roll the dough out to a 8x12" rectangle.
Spread with softened butter, then sprinkle with brown sugar and cinnamon.
Roll the dough up jelly roll style, then slice into 6 equal slices.
Place the rolls into the prepared pan.
Pour warmed heavy cream over the rolls.
Bake for about 25 minutes or until the center roll is baked and not gooey. Pull up on the edge of a center roll to see if it looks done. Check the rolls at 20 minutes. If they are getting too brown, cover loosely with foil and continue to bake.
In a small bowl, whisk together the powdered sugar, butter, vanilla and cream. Drizzle in more cream if needed to get the consistency of the glaze you'd like.
Spread the glaze over the warm rolls.
Serve immediately. Store any leftover rolls in an airtight container at room temperature.
The calories shown are based on the recipe making 6 frosted rolls, with 1 serving being 1 frosted roll. Since different brands of ingredients have different nutritional information, the calories shown are just an estimate. **We are not dietitians and recommend you seek a nutritionist for exact nutritional information.**