1Before you warm your skillet,...slice your peppers, squash and zucchini, you may cut your onions as you wish, but it will be better to slice them..rinse everything and pat dry. Warm skillet, add butter and let it melt slow,...do not burn butter it will ruin the taste. After butter is melted, add onion and peppers. Cook until until soft, you might have to add more butter so they won't stick, then add your squash/zucchini,salt and pepper and stir until mixed well. Add water and cover to simmer until most of the water has evaporated. After water has evaporated add canned tomatoes and liquid, stir again,..turn the heat up and cook until almost a slight boil,..then remove from heat, add cheese on top , cover with lid and let cheese melt and enjoy.