Kara and Marni Powers are the founders of Twin Tastes where they cook, dine and blog their way through Boston and beyond. The twin sisters see the act of cooking and entertaining as a form of creative expression, an art that encourages the mixing of flavors, spices, techniques and stories. Their interest in cooking dates back to their Greek grandmother’s open-arms approach, letting them taste her delicious creations like her famous spanakopita. Here's their favorite recipe for …