Combine 1 cup of breadcrumbs with 1/2 cup of milk, let them stand for 5 minutes.
Add chicken, 2 tbsp sour cream, 1 tsp salt, 1/2 tsp pepper, 1 egg and 1 onion to the bread mix & stir together.
Using wet hands make oval patties than dredge both sides in flour.
Place patties in the preheated nonstick skillet with 2-3 Tbsp of oil. Cover and cook until golden on both sides, 5 minutes on the first side and 3 minutes on the next. Add more oil as needed.