Easy Scalloped Potatoes with Bell Peppers

2 cups frozen peppers and onions 1/2  cup margarine 1/2 cup sour cream 2 cans sliced new potatoes, drained 1 cup Velveeta shreds 1 cup mozzarella shreds Microwave peppers and onions for 1 minute or so until defrosted. Pat dry with paper towel. Melt margarine in microwave. Stir in sour cream and peppers to melted margarine, blending well. Layer…