Sprinkle chicken with salt and pepper; place in slow-cooking pot. Insert cloves in one onion. Put all onions in pot. Add garlic, marjoram, thyme, bay leaf, and wine. Cover and cook on low 5 to 6 hours. Remove bay leaf and cloves. Stir in sour cream. Turn control to high. Combine biscuit mix with parsley; stir milk into biscuit mix with fork until well moistened. Drop dumplings from teaspoon around edge of pot. Cover and cook on high for 30 minutes.