Reduce heat to medium; add onions to same skillet with drippings. Cook and stir 3 to 4 minutes or until softened. Add garlic; cook and stir 1 minute. Add paprika, smoked paprika, red pepper and remaining flour mixture; cook and stir 1 minute. Beat in broth and tomato paste with whisk. Heat to boiling, scraping any browned bits on bottom of skillet. Remove from heat; carefully pour broth mixture over short ribs in slow cooker.