This diversified food chain was started by the founders Harold Butler and Richard Jizek when they opened a modest donut store in Lakewood, California with the goal of serving the best coffee in town, along with a doughnut and excellent customer service. Now it has grown throughout the country and the world, gaining fame for its delectable pancakes and the dennys promo code Grand Slam, a renowned breakfast special that has become a national institution. Get the most delicious of this diverse food chain at a discounted price through Dennys 20 Off Coupon.