Season wings with salt and pepper.
Then divide wings into freezer bags,(be sure to label bags first) Then pour one cup of wing sauce into each bag and make sure sauce covers all wings. Freeze until needed.
Thaw in refrigerator for 24 hours; pour contents into slow cooker and add butter. Cook on low 6-8 hours or high for 3-4 hours.
Once wings are fully cooked, carefully take them out of slow cooker and place on pan that has been sprayed with cooking spray and broil for 3-4 minutes. This really increases the flavor and makes for a crisper wing! Then place wings in a bowl and toss with more wing sauce and garnish with green onions (optional). Serve with celery and blue cheese dressing.
Instant Pot recipe update: Place frozen wings in Instant Pot with 1 cup of the above sauce. Then cook on high pressure for 10 minutes. Then do a quick release and broil for a couple minutes to make them crispy.