Preheat oven to 425°F. Line a baking sheet with parchment paper and lightly grease with olive oil.
Butterfly chicken breast in half, cutting almost all the way through, to thin. Then cover with some parchment paper and tenderize with a meat tenderizer lightly to even it out.
Set up three breading stations:
Bowl 1: flour, salt, pepper, parsley, garlic powder, onion powder, and paprika
Bowl 2: egg and water, whisked together
Bowl 3: panko breadcrumbs and parmesan cheese
Dredge each chicken cutlet in the flour mixture, coating all sides lightly.
Dip into the egg mixture, allowing excess to drip off.
Press firmly into the breadcrumb mixture until evenly coated on all sides.
Place the breaded chicken onto the prepared baking sheet.
Lightly spray or drizzle the tops with olive oil.
Bake for 18–22 minutes, flipping halfway through, until golden brown, crispy, and the internal temperature reaches 165°F.
Let rest for 5 minutes before slicing and serving.