Heat the oven to 400°F (204°C). Put the panko, garlic powder, and Parmesan in one shallow bowl; the beaten eggs and water in a second; and the flour in a third.
Season the chicken. Coat each cutlet in flour, then egg, then the panko mixture.
Heat about 1/4 in (6 mm) vegetable oil in a deep skillet over medium-high heat. Fry the chicken until golden and cooked through, 5-7 minutes total, turning halfway. Drain on paper towels.
For the marinara, heat the olive oil over medium heat. Cook the onion and garlic until soft, about 4 minutes. Add tomatoes and water; season with salt, pepper, and red pepper flakes. Simmer 10 minutes, then stir in parsley.
Spread the sauce in a 9 x 13 in (23 x 33 cm) baking dish. Arrange the chicken over the sauce, top with mozzarella, and bake 10-12 minutes, until melted. Broil briefly for extra browning if desired.
Garnish with parsley and Parmesan and serve immediately.
Notes
This retains the older Delish formulation represented by the supplied scan. Delish has since substantially revised the online recipe.
