This is such an easy and economical dish and had the added bonus of using up some ingredients that might be past their best.
There is no need to be exact with quantities either, it's that sort of dish.
I started with some thick slices of homemade bread that was slightly stale and buttered each slice lightly. Cut into cubes.
I chopped 1/2 a red onion.
I chopped roughly 10 tomatoes that were getting a bit old but still perfectly useable.
All this goes into a bowl together and drizzled with some olive oil. Sprinkle with garlic salt if desired and season with pepper.
I tipped all this into a baking dish and sprinkled with a little parmesan, then grated tasty cheese.
Pop into a hot oven (about 180 degrees C or 350 F) until golden brown on top.