In 12-inch ovenproof skillet, melt 1/4 cup of the butter over medium-high heat. Add half of the flour-coated beef; cook 6 to 8 minutes or until lightly browned on all sides. Remove from skillet. In same skillet, melt remaining 1/4 cup butter; cook remaining beef. Add already cooked beef back to skillet. Stir in dressing mix, pepperoncini and broth; heat to boiling. Cover and reduce heat; simmer 18 to 20 minutes, stirring occasionally, until beef is tender. Stir in potatoes; cover, cook 5 to 8 minutes or until potatoes are tender. Stir in frozen peas and carrots. Top with biscuit pieces around outer edge of pan.