heat oven to 350. Place chicken breasts on a work surface and brush each one with the mustard. In a lg shallow bowl, stir together panko crumbs, parmesan cheese, minced onion, garlic powder and oregano.
Spray lightly, a lg baking pan w/ cooking spray. Roll each chicken breast in crumb mix. Place in pan. Drizzle w/ butter.
bake, uncovered for 30 mins. arrange chicken on a platter, mix yogurt and spoon over chicken. Sprinkle w/ parsley. Great served w/ roasted new potatoes!