Adjusted earnings declined during the quarter. Cracking Open Panera's Box Panera's financials didn't need to be tweaked for an extra operating week. It's growing faster than Potbelly despite being a larger chain. Revenue increased 16 percent in its latest quarter. Its growth was also fueled largely by expansion. Comparable net bakery-cafe sales inched just 1.7 percent higher. This doesn't mean that Panera is doing well. The chain believes that business could have been better if the weather had been more cooperative. Its earnings guidance for the current quarter is also well short of what analysts were forecasting. In the end, both Potbelly and Panera failed to impress on Tuesday afternoon. They both posted sales that were just shy of Wall Street expectations, and it's hard to win over investors when your comparable-restaurant sales are barely keeping up with the 1.5 percent U.S. inflation rate.