Cut the onion into small cubes and sweat in the cooking oil, add the bacon cubes and fry both together for a short time.
Add the cut mushrooms and sauté for 5-8 minutes, covered, over medium heat. Then deglaze with the white wine and simmer for another 5 minutes with the lid closed. Now add the sour cream and stir everything. Finally season with salt and pepper and add the sweet cream. Caution, do not boil anymore!
In the meantime, cook the tortellini in salted water until cooked.
The sauce is either mixed directly with the finished tortellini or just poured over the plate.
If you want, you can sprinkle some freshly grated Parmesan on top.