Combine Hellmann's® or Best Foods® Real Mayonnaise, basil, vinegar and garlic in small bowl.
Season vegetables with salt and pepper, if desired, and toss with 1/3 cup Mayonnaise mixture. Arrange vegetables in single layer on 2 rimmed baking sheets. Roast vegetables 45 minutes, turning once, until golden brown and tender.
Spread remaining Mayonnaise mixture on cut sides of focaccia. Top bottom with vegetables, cheese, then remaining focaccia. Slice into 8 wedges, serve warm or at room temperature.