Preheat oven to 350 degrees . In large nonstick skillet, heat oil over medium-high. Add onion and 1 tbsp. vinegar. Cook, stirring often, until browned, about 8 minutes. Stir in beans, applesauce, mustard, paprika, 1 tbsp. vinegar and 3 tbsp. water. Transfer to 1 1/2-qt. baking dish. Bake uncovered until bubbling, 35 to 40 minutes.