Cut tomatoes into thick slices and remove some of the seeds.
Sprinkle 1/2 cup of the bread crumbs over the bottom of a buttered 8 inch square baking pan.
Arrange tomato slices in pan in 3 layers, sprinkling each layer with onion, seasonings and 1/2 cup bread crumbs.
Dot each layer with butter.
Bake in a preheated 375Â° oven about 30 minutes or until bubbling and browned.