4 Medium-Large Portabella Mushroom Caps 1 Cup Pesto 1/2 Cup Bread Crumbs 1/2 Cup Chopped Walnuts 1 Tbsp Olive Oil In a mixing bowl combine pesto with bread crumbs. Brush the outsides of the Portabella caps lightly with olive oil. Place mushrooms in a baking sheet an fill caps with…