Peel the onion and trim the top.
Cut the onion into quarters without cutting all the way through.
Soak the onion in cold water for 30 minutes.
Mix flour, paprika, garlic powder, onion powder, cayenne, salt, and pepper in a bowl.
Dredge the onion in the flour mixture.
Dip the onion in water to moisten.
Coat the onion with breadcrumbs.
Heat vegetable oil in a deep fryer to 350°F (175°C).
Fry the onion for 10-15 minutes until golden brown.
Remove and drain on paper towels before serving.