NYT Cooking: These scones, created by Joanne Chang for her Flour Bakery Café in Boston, are studded with fresh blueberries, sweetened with maple syrup and made with a blend of whole-wheat and all-purpose flours — but don’t think of them as health food. They’ve also got crème fraîche and plenty of butter. They’re big. They’re glazed. And they’ve got a singular texture: tender, like a layer cake, but also f...