Sprinkle chicken with salt, cayenne, paprika, curry powder, and ginger. Add preserves, vinegar, and soy sauce to gallon freezer bag. Add in sweet potatoes and onion, and too with chicken. Seal bag and place in freezer. Thaw overnight when ready to use.
Cook on low for 6-8 hrs.
Combine chicken broth and cornstarch and mix well. Add to slow cooker. Cover and cook on high 10-15 minutes until sauce thickened.