Center Cut Doughnuts will serve its last doughnut this weekend. The Hampden bake shop at 3528 Chestnut Ave. will close after a going away party Sunday, owner Josh Kowitz said. The shop will be open regular hours Friday through Sunday. Full Circle, another doughnut shop, will open in its place, Kowitz said. Center Cut Doughnuts got its start at the Hampden Farmers’ Market, where Kowitz sold doughnuts for two years before opening his permanent shop in January, in the former B. Doughnut space.