Combine the olive oil and basil in a large frying pan over medium heat. Add the cubed squash and zucchini and cook about ten minutes, stirring frequently. Add onion and garlic and cook another ten minutes – squash and zucchini should be tender and break down. Drain the liquid in colander, making sure to scrape the pan to get all onions and garlic.
In a large mixing bowl add the cheese mix and ½ of the crumb mix with the veggies, stir well. Pour in to a greased (I used a little olive oil on a paper towel to grease my pan) baking dish, sprinkle the remainder of topping crumbs.
Bake at 325 degrees F oven for 20 minutes or until topping is brown.