Grease a 2½ quart baking dish and arrange half the potato slices in overlapping rows. Dot with half the butter. Sprinkle with half the sage, tarragon, peppers, onion, rice and zucchini.
Dot with remaining butter and repeat layering.
Cover and bake casserole at 350 degrees for 1½ hours or until potatoes are tender. Uncover; top with tomato slices and cheese. Bake 10 minutes longer or until tomatoes are warm and cheese is melted. Remove from oven; cover and let stand for 10 minutes before serving.