In a reasonably deep saucepan, cook the onions in the olive oil until soft and translucent, then set the onions aside. If your pan is large enough, move them to the side, or completely remove them from the pan.
In the same pan, fry the bacon with the bay leaf until the bacon has rendered it's fat, is brown but not crisp.
Pour off most, but not all of the bacon fat. Add back the onions, the white wine, and let simmer for a few minutes.
In the meantime, cook the fettuccine noodles according to package directions. Once cooked, drain reserving about ½ cup of the starchy pasta water.
Add the tomato sauce, chicken broth, oregano and pepper flakes, stir and let simmer another ten minutes. (Add a little more chicken broth, or better yet, some of the starchy pasta water, as necessary, if the sauce is drying out.)
Toss about ¼ of the sauce with the fettuccine and parmesan, divide the pasta on the plates, then spoon the rest of the sauce on top of the pasta. Sprinkle with more grated parmesan and serve.