In a large plastic bag, combine the dry onion soup mix and paprika. Add in meat and shake the bag to coat the meat with the seasonings. (You may have to do this step in two batches for all the meat to fit) Once the meat is coated spread out evenly into a greased 7-quart crock pot.
Top meat evenly with diced potatoes, carrots and onion.
Mix the cream of celery soup and ketchup in a small bowl. Pour mixture over the meat and vegetables.
Cover the crock pot with lid. Cook on low heat for 8 hours or until meat is cooked through and vegetables are tender. Stir to combine everything then serve.