extra-virgin olive oil
small yellow onion, finely chopped
cloves garlic, finely chopped
(28-oz.) can crushed tomatoes
large sprigs basil
Kosher salt
Freshly ground black pepper
panko bread crumbs
garlic powder
finely grated Parmesan, divided
all-purpose flour
large eggs
(1/4"-thick) boneless, skinless chicken cutlets (about 1 1/2 lb. total)
Kosher salt
Freshly ground black pepper
shredded mozzarella
vegetable or canola oil
Chopped fresh basil, for serving