1) In a 1-quart saucepan, melt butter on medium heat.
2) Add in the prosciutto or ham along with the scallions.
3) Toss in the mushrooms too. Saute the mixture for about a minute.
4) Add in the thawed peas. Saute for about 4 minutes till the mixture is heated through completely.
5) Serve the Peas And Mushrooms Prosciutto with a sprinkling of parsley, if desired.