Spinach Dip

Ingredients

• 2 pkgs. frozen chopped spinach, drained
• 1 medium onion, chopped fine
• 1 pkg. Knorr's vegetable soup mix
• 1 small jar mayonnaise
• 1 pint sour cream
• 1 small can water chestnuts, sliced
• 3 oz. pkg. cream cheese, optional