Heat olive oil in 12-inch skillet and cook chopped mushroom, sausage and onion, stirring occasionally, until sausage is browned, about 5 minutes. Stir in roasted peppers and cook 2 minutes. Stir in Wish-Bone® Italian Dressing and simmer 1 minute. Stir in 1 tablespoon basil. Arrange remaining 4 mushrooms caps on baking sheet. Evenly top with sausage mixture, then sprinkle with bread crumbs and cheese.
Bake 20 minutes or until mushrooms are tender. Sprinkle with remaining 1 tablespoon basil. Evenly divide arugula on 4 plates, then top with mushrooms. Serve, if desired, with additional Dressing.