Combine Hellmann's(R) or Best Foods(R) Real Mayonnaise, mushrooms, cranberries and milk in large microwave-safe bowl. Microwave at HIGH 45 seconds; stir. Stir in hot peas, then turn into greased 1-quart shallow casserole.
Combine stuffing mix with Country Crock(R) Spread in a small bowl, then sprinkle over pea mixture. Bake 10 minutes or until golden brown.