Heat the oil in a heavy-bottomed 10- or 12-inch skillet over medium heat
Add the roma tomatoes, sun dried tomatoes, salt, black pepper, and red pepper flakes
Cook until the tomatoes soften and release their juices, 5 to 6 minutes.
Stir in the garlic and cook until fragrant, about 1 minute
Increase the heat to medium-high, stir in the tortellini, stirring occassionally until tortellini is plump and tender, 3-5 minutes
Remove from heat and stir in the spinach until it wilts, about 1 minute.
Serve immediatly with grated parmesan cheese