The Clark candy bar was introduced in 1917 by David L. Clark in Pittsburgh, Pennsylvania. The Clark bar is a crispy peanut butter–based candy coated in milk chocolate. Inside, the filling has a light, flaky, crunchy texture. This is one of the most popular candy bars in the world, and everyone will instantly know you are a fan when you wear this Born In The 'Burgh Clark Bar Boyer T-Shirt!