Cheesy Zucchini Pizza Casserole

Adapted by Marcia Dumaresq from Cooking.com  Ingredients 1 1/2 pounds zucchini, cut into 1/4 inch coins, then halved 2 cloves garlic minced 1/4 teaspoon salt 1/4 teaspoon pepper 1 Tablespoon olive oil 2 Tablespoons minced fresh basil 1 onion, diced 3 tomatoes, diced...