McDonald's is investing $8.5 billion revamp its menu, focusing on high-protein choices and new health-focused ingredients. The move has led to a 6% drop in its shares. Meanwhile, drive-thru menus across the country are being updated, with restaurants adding and removing items. The Red Chickz has signed franchise development agreements in Dallas-Fort Worth and Las Vegas, further establishing its presence in the fast-casual market. Diners are also highlighting the best mashed potatoes served by various restaurant chains.