Heat bacon drippings or oil in a large pan. Add pot roast and sear on all sides. Place in crock pot.
Combine cranberry sauce, tomato sauce, water, and onion soup mix. Pour over pot roast.
Place lid on crock pot and cook on LOW for 8 to 10 hours.
Place hot cooked noodles on a serving platter. Remove meat from crock pot and place on top of noodles.
Dissolve cornstarch in about 1 tablespoon water. Add to liquid in crock pot. Place lid back on and turn to HIGH for 10-15 minutes. Pour gravy over meat and serve.
Notes
Nutritional info is provided as an estimate only and will vary based on brands of products used. Not to be used for specific dietary needs.