Prepare the onion rings:

• Cut the onions into 1/2-inch thick rings and separate them carefully. Set aside.

• Cut the mozzarella cheese into sticks or cubes that are about the size of the onion rings, as these will be stuffed inside.

Stuff the onion rings:

• Take a few onion rings and stuff each one with a piece of mozzarella cheese. Stack the rings, so you have a filled onion ring with cheese in the center. Repeat until all onion rings are stuffed.

Prepare the breading station:

• In one shallow bowl, mix the flour, salt, pepper, garlic powder, and paprika.

• In a second shallow bowl, beat the eggs.

• In a third shallow bowl, combine the breadcrumbs and Parmesan cheese.

Coat the onion rings:

• Dredge each stuffed onion ring in the flour mixture, making sure it’s evenly coated.

• Dip it into the beaten eggs, and then coat it in the breadcrumb mixture, pressing lightly to ensure the breadcrumbs stick.

Fry the onion rings:

• Heat vegetable oil in a deep pan or fryer to 350°F (175°C).

• Fry the coated onion rings in batches for 2-3 minutes, or until golden brown and crispy on all sides. Use a slotted spoon to remove them from the oil and place them on a paper towel-lined plate to drain excess oil.

Make the garlic butter sauce:

• While the onion rings are frying, melt the butter in a small saucepan over medium heat.

• Add the minced garlic and cook for 1-2 minutes until fragrant, but not browned.

• Stir in the chopped parsley, red pepper flakes (if using), and salt to taste. Remove from heat.

Serve:

• Once the onion rings are done, drizzle the garlic butter sauce over the crispy onion rings. Serve immediately, garnished with extra parsley if desired.