Heat broiler. place peppers, skin side up, on foil lined baking sheet broil them on each side til char like (18-20min) when cooke place in bowl & cover w/ plastic wrap to keep steam inside for easy peeling,remove w/ paper towel & shred w/ fingers into strips,reserve juice from peppers do not discard.Set aside both peppers & juice.
In pot of boiling water salt & cook pasta according to box,drain & reserve 1/2cp pasta water.Meanwhile , heat skillet w/ olive oil over med. heat & cook sausage breaking it up into sm. pieces, brown 10min or so till all cooked, add roasted peppers & its juice, cook 7min more. Transfer sausage mixture to serving bowl; add pasta, butter,reserved pasta water & parm-regg cheese.Toss & enjoy