Κέικ με γεύση σπανακόπιτας
spinach (about 400 grams) • all-purpose flour (about 250 grams) • baking powder • eggs • yellow onion • leek • dill (about) • plain Greek yogurt (about 200 grams) • olive oil (use the yogurt container to measure, about 80 ml) • feta cheese (about 200 grams) • Shredded yellow cheese, optional • green onions