Spinach and feta triangles are a delicious appetizer or snack made with phyllo pastry, spinach, feta cheese, and herbs. The phyllo dough is layered with a mixture of sautéed spinach, crumbled feta cheese, onions, garlic, and herbs, then folded into triangles and baked until crispy and golden. These savory triangles are packed with flavor and make a great addition to any party or gathering. They can be served warm or at room temperature and are sure to be a hit with your guests.