Preheat oven to 450 degrees.
Spread yellow squash, zuchini, onion and tomatoes on a large jelly roll pan or cookie sheet.
Toss with 3 T. olive oil, spread evenly on the pan and roast for 30-40 minutes until vegetables are tender, slightly darkened and caramelized. To ensure even roasting, toss the vegetables halfway through the roasting time. Remove from oven. Transfer vegetables to a shallow baking pan or individual gratin dishes.
In a medium mixing bowl, combine 3 T. olive oil, bread crumbs, mozzarella cheese, parmesan cheese, garlic and salt. Spread the mixture evenly over the roasted vegetables and return to the oven for 6-7 minutes until the bread crumbs are toasted and the cheese is melted.
This video is a creation of ginnymccormack. You can visit ginnymccormack for complete recipes, and more videos.
Crunchy fresh vegetables are nutritious and refreshing treats during hot summers. Chef Ginny shows how to make the colorful Summer Vegetable Gratin using a lot of vegetables and just a few seasonings. Great with toasted bread crumbs and grated cheese on the top!