Spray half hotel pan with nonstick cooking spray.
Place bread cubes in bottom of prepared pan; top with 1 cup Extra Melt Cheese, zucchini, bell pepper, green onions and tomatoes.
Combine Cream Sauce Base, eggs, salt and pepper in bowl; whisk until smooth. Pour mixture over ingredients in pan. Cover; refrigerate 8 hours or over night.
Heat oven to 350ºF. Let strata sit at room temperature while oven is heating. Uncover; bake 45 to 50 minutes. Top with remaining cheese. Continue baking for 15 to 20 minutes or until knife inserted in center comes out clean. Let stand 10 minutes before serving.