We've been making this dip for probably 20 years.
We usually make it over the holidays and I've taken it to potluck functions. It's just on the back of the Knorr Vegetable Mix package, but it's definitely a family favorite so I wanted to reference it here so it would be easily accessible for the kids.
I package Knorr Vegetable Recipe Mix
1 package (10 oz.) frozen chopped spinach (thawed, drained, and squeezed dry)
1 can (8 oz.) sliced water chestnuts, chopped
3 green onions, chopped
16 oz. sour cream
1 C mayo
*Combine the sour cream and mayo. Stir in the spinach. Mix in the Knorr vegetable mix, water chestnuts, and green onions. Chill. Serve with crackers and vegetables.