Stouffer's Macaroni and Cheese

2 − 10 ounce packages Stouffer's Frozen Welsh Rarebit
(defrosted)
1 cup elbow macaroni
2 teaspoons salt
1 cup sour cream
1/4 cup grated Cheddar cheese
Preheat oven to 400 degrees.
Heat Welsh Rarebit in top of double boiler over rapidly
boiling water for 15 to 20 minutes just until hot.
Cook macaroni following package directions. Drain well.
Pour Welsh Rarebit into a 2−quart casserole; add cooked
macaroni, salt and sour cream. Stir to combine. Sprinkle with
grated cheese. Bake at 400 degrees for 20 minutes.