Pour all except 1 tablespoon fat from skillet. Decrease heat to medium; add onions to skillet and cook about 4 minutes, stirring frequently, until softened. Add garlic, paprika, red pepper, remaining 1/2 teaspoon salt and 1/4 teaspoon pepper; continue to cook and stir 1 minute. Transfer to slow cooker. Add chicken broth to skillet. Cook over medium heat 1 minute, scraping up any browned bits on bottom of skillet with wooden spoon. Transfer to slow cooker. Cover; cook on Low heat setting 5 to 6 hours or until juice of chicken is clear when thickest part is cut to bone (at least 165°F).