With kitchen shears, cut chicken breasts into about 70 nuggets. In medium bowl, mix together yogurt, oregano, basil, rosemary and thyme. On wax paper, mix together breadcrumbs, sesame seed, salt and pepper. Cover a 10-1/2 by 15-1/2 by 1-inch baking pan with foil; spray with vegetable cooking spray. Dip each nugget in yogurt mixture and then roll in crumb-sesame mixture. Arrange nuggets in single layer in prepared pan. Bake in 325F oven for about 20 minutes. Turn oven setting to "Broil" and continue cooking until nuggets are brown on top, about 3 minutes. Serve on heating tray with your favorite dipping sauce.