1 pkg. scalloped potatoes
1 (16 oz.) can tomatoes
1 1/2 c. water
1/4 tsp. oregano
1 (4 oz.) pkg. sliced pepperoni (or 1/2 lb. hamburger, browned)
1 (4 oz.) pkg. mozzarella cheese (or more)

Place potato slices and sauce mix in greased 2 quart casserole. Heat tomatoes, water and oregano to boiling. Stir into potatoes. Arrange pepperoni (or hamburger) on top. Sprinkle with cheese. Bake, uncovered, in 400 degree oven for 30-35 minutes.