Preheat oven to 375 degrees and grease a 9-inch pie pan or cake pan.
In a large bowl, stir together Bisquick, sugar, and buttermilk just until a dough forms. If there is still some dry bisquick, add a little more buttermilk.
Sprinkle flour on a pastry mat, counter, or a piece of parchment paper.
Roll the dough out into about an 8x12-inch rectangle.
In a small bowl, stir together brown sugar and cinnamon. Add 2 tablespoons of the melted butter and mix it in.
Brush the rest of the melted butter on the dough.
Sprinkle the cinnamon mixture evenly over the dough.
Roll the dough up jellyroll style starting at a long end.
Use dental floss or a sharp knife to cut into 8 slices.
Place the rolls in the prepared pan. Bake for 22-25 minutes, or until the centers of the rolls are no longer gooey.
To make glaze, whisk together all ingredients in a medium bowl. Add more cream if needed to thin it.
Drizzle glaze on cinnamon rolls.
Notes
Dental floss works really well to cut the dough into slices without smooshing it.If the tops of the cinnamon rolls start to get too browned before the middle is cooked, cover with aluminum foil.