This grew out of my addiction to Campbell's Bean with Bacon soup. Of course, I now have my own recipe for the soup and don't have to use canned unless I want the convenience. My husband loves smoked or polish sausage, so this is a marriage of two favorite foods.
Slice the Keilbasa into 1/4-inch diagonal pieces. In a large skillet, brown the sausage with the peppers and onions until onions are translucent but not browned. Place sausage and vegetables into a 2-1/2 quart casserole dish. Add the drained navy beans and mix well.
Stir the bean liquid into the bean with bacon soup, and mix well - you should do this in a mixing bowl, not in the can. Add the soup mixture to the casserole and blend well.
Cover and bake at 350°F for 30 minutes. (Then, if desired, top with the can of Ro-Tel.) Uncover and continue baking another 30 minutes or so, until done to your liking.
Another option: you can also mix the Ro-Tel with some cooked rice (about 1 1/2 cups) and spread on top. Or you can stir the cooked rice into the casserole before baking.