Blue Willow Inn is a restaurant set in a Southern plantation style mansion in the town of Social Circle, about 1 hour East of Atlanta (off I-20). While its open for Lunch & Dinner buffets everyday, weekend brunches are the most popular. And with good reason, it's southern cuisine at its best. Totally worth the one hour drive back and forth. Plus the ambiance makes the food taste that much better.
Just read the reviews on Yelp if you're not convinced - http://www.yelp.com/biz/blue-willow-inn-restaurant-social-circle