Saute onion, pepper, garlic, and livers in butter until livers are just cooked, about 10 minutes.
Remove clove of garlic.
Add diced avocado (if desired save a few cubes to use as a garnish) and cook gently until heated through (about 1 minute).
Stir in sour cream just to heat.
Add Worcestershire, paprika, salt, and pepper.