* 1 (10-ounce) package frozen onions and peppers may be substituted for fresh
onion and bell peppers.
** 1 (10 3/4 ounce) can cream of mushroom soup may be substituted for cream of
Unbaked casserole may be made one day in advance. Cover and refrigerate. Let
stand at room temperature 30 minutes before baking as directed.
To freeze unbaked casserole, prepare as directed, omitting Parmesan cheese. Cover
tightly, and freeze. Let stand at room temperature 30 minutes before baking. Bake,
covered, at 350 degrees for 50 minutes. Uncover; sprinkle evenly with Parmesan cheese,
and bake 10 more minutes or until cheese is lightly browned.