Spinach and Cheese Empanadas Recipe

Name: Spinach and Cheese Empanadas Recipe
Prep time: 25 min
Cook time: 15 min
Total time: 40 min
Cuisine: Latin American, American, Mediterranean
Ingredients: extra-virgin olive oil; 1 small yellow onion, diced; 2 large cloves garlic, finely minced; 10 ounces baby spinach; kosher salt and freshly ground black pepper; 4 ounces crumbled feta cheese; 6 ounces shredded mozzarella cheese; 1 lemon, zested; all-purpose flour, for dusting; 1 (14-ounce) package refrigerated pie crusts; 1 large egg