Combine cinnamon with brown sugar; set aside
Place a large sheet of parchment paper beside work surface; lightly dust work surface with flour
Carefully remove dough onto lightly floured work surface with D-shaped spatula, working to maintain air in dough
Dust top of dough; dust parchment paper with flour and turn dough gently and carefully into middle of floured paper
Gently roll dough into a large rectangle, ensure surface next to paper is lightly floured and dough is not sticking to it
Once dough is rolled into a large rectangle a good half inch or thicker, place dobs of softened butter over entire surface
Using an offset spatula, spread the softened butter over the complete surface of the dough (work to not push into the dough to deflate it)
Sprinkle the cinnamon sugar mixture over the entire surface of the dough, getting as close to the edges as possible, with the exception of the edge furthest from you
Use the offset spatula to spread the sugar cinnamon sugar over the buttered dough evenly
With the dough in landscape position, roll it over onto itself, then using the parchment paper to roll the dough away from you, continue to roll the dough until in a long log (about 24 inches)
Using a very sharp knife, divide log in two and mark lightly on surface every 2 inches from centre on each side to mark where to cut for making 12 buns with 2 small ends
Bring the pyrex pan to the work area with the goo in the bottom; start to cut the buns and place tightly together in the pan three across and four down
Cover with damp cloth; proof for 20-30 more minutes