Grilled Veggie-Portobello Mushroom Burgers

Details

Ingredients

• 6 large portobello mushroom, stems removed
• 1 eggplant, sliced into 1/2 inch rounds
• 1 medium yellow squash, cut into 1/4-inch slices
• 1 zucchini, cut into 1/4-inch slices
• 1 (16 fl oz) bottle balsamic vinaigrette
• 1 (4 ounce) package crumbled blue cheese
• 6 hamburger buns, split and lightly toasted