Squash Casserole

I think I need to work on my recipe names! But this was delicious. Everyone loved it!

6 small summer squash, cut crosswise in 1/4 inch slices
1 medium onion, sliced thinly
2 large tomatoes, diced
1/2 c. shredded cheese (See note)
1 tsp. salt
Dash of pepper
3 tbsp. butter, cut in small pieces
2 tbsp. soy sauce

More cheese to sprinkle on top, if desired

Mix all ingredients well. Place in a casserole dish and bake at 350 for 30 minutes.

Note: The original recipe called for cheddar and that's what I used. But next time I will alter the entire dish by changing the cheese and seasonings: pepper jack with some cilantro and chilies, mozzarella with oregano, etc.