This is a great recipe and my thoughts, would be better for you. I hope you will enjoy it.
Sour Cream Substitute
1/4 c. non fat powdered milk
1/2 c. cold water
Mix the above ingredients together, then blend it with the following,
8 oz. uncreamed cottage cheese
2 tsp. lemon juice
1/2 tsp. salt
Blend well and keep refrigerated until you are ready to use.