Preheat oven to 400°F and a broiler.
Scatter pumpkin seeds on a baking sheet and sprinkle with sugar, chili powder and cinnamon. Roast for about 30 minutes, until golden brown, and set aside.
Place pumpkin quarters on a baking sheet and roast for about 30 minutes, until tender. Once cool enough to handle, scoop the flesh out of the quarters and transfer it to a food processor. Pulse until smooth.
Place a large pot of salted water over high heat to boil. When water is boiling, drop tortellini and cook to al dente according to package directions. Drain cooked tortellini and reserve.