Mom's Chicken Salad

~ 3 chicken breasts, cooked, cooled, and shredded

~ 1 1/4 cup mayonnaise

~ 1 tbsp apple cider vinegar

~ 2 tbsp onion, minced

~ 1 cup celery, chopped

~ 1/2 tsp sugar

~ Salt and pepper, to taste

Mix all ingredients together. Cool before serving. Serve on deli croissants.