Bring a large pot of water to a boil, season with salt.
Render bacon until crispy in a large skillet over medium heat, and set aside to drain.
Saute onion in bacon fat over medium heat until translucent, about 4 minutes.
Add tomatoes, bring to boil.; season with salt and pepper.
Add cream and simmer a few minutes.
Cook tortellini according to package directions.
Drain tortellini and toss with the sauce in a large mixing bowl.
Stir in cheese and basil.
Top with crispy bacon over the top before serving.