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Golden brown mozzarella stick onion rings piled high featuring a spicy chip crust and melted cheese center.

No-leak Mozzarella Stick Onion Rings

Rebecca Blumer
These baked mozzarella stick onion rings combine the best of both snacks: sweet onion, gooey string cheese, and a crunchy panko-Chex coating. Using a "Double Freeze" technique prevents leaks for a perfect game-day appetizer.
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Prep Time 30 minutes
Cook Time 22 minutes
Marinating and Freezing Time 1 hour 45 minutes
Total Time 2 hours 37 minutes
Course Appetizer, Snack
Cuisine American
Servings 4 servings
Calories 420 kcal

Equipment

  • Baking Sheet
  • Three shallow bowls
  • Wire rack (optional)

Ingredients
 

  • 1 large sweet onion, cut into 1/2 inch thick rings
  • 2 1/2 cups buttermilk
  • 12 sticks part skim mozzarella cheese sticks, frozen
  • 1 cup whole wheat flour, divided
  • 3 large eggs
  • 1/2 cup cornmeal
  • 1/2 cup panko
  • 1/2 cup Corn Chex or cornflakes, crushed
  • 1/2 teaspoon kosher salt
  • 1/4 teaspoon ground black pepper
  • Nonstick cooking spray
  • Marinara sauce or ranch dressing, for dipping

Instructions
 

Soak the onions for tenderness and grip

  • Set your onion rings into a large, shallow container and pour in the buttermilk, turning the rings so every surface gets coated. Cover and refrigerate for at least one hour, or overnight, to help the onions relax and the coating cling better.

Preheat, pair the rings, then stuff with cheese

  • Heat the oven to 425°F and line a baking sheet with foil. Pull the onion rings from the buttermilk and let the excess drip off for a moment.
  • Arrange the rings in pairs on the sheet, nesting a smaller ring inside a larger one so there’s a narrow gap between them (about 1/2 inch).
  • Take the frozen string cheese out for about 5 minutes to soften slightly. Quarter each stick lengthwise, then press the cheese quarters into the gap between the onion rings until snug (about 2 quarters per ring).

The Double Freeze and the dredging station

  • Slide the assembled, unbreaded rings into the freezer for 45-60 minutes until they feel stiff and locked.
  • Set up your dredging station: put 3/4 cup flour in the first bowl; beat the eggs until smooth in the second bowl; mix the remaining 1/4 cup flour, cornmeal, panko, crushed Corn Chex, kosher salt, and black pepper in the third bowl.
  • Bread each semi-frozen ring gently but thoroughly: dip in flour first, then egg wash, then back into flour. Dip once more in egg, then press into the panko mixture to ensure the coating adheres firmly.

Bake until crisp and golden

  • Return the coated rings to the baking sheet and spray liberally with nonstick cooking spray.
  • Bake for about 22 minutes, flipping once halfway through, until the coating is deeply golden and crisp.

Notes

Temperature Synchronization: Freezing the assembled rings before breading is critical. It drops the cheese’s starting temperature, allowing the crust to set and crisp in the oven before the cheese melts completely and leaks.
Onion Prep: Remove the thin, papery membrane from inside the onion rings before stuffing. This ensures the onion bites cleanly rather than pulling out in one long strand.
The Sealant Technique: The double flour and egg wash layers (flour-egg-flour-egg) create a tight seal that fills gaps between the onion and cheese, preventing leaks during baking.
Air Fryer Method: Cook at 375°F (190°C) for 8-10 minutes, flipping halfway through. Spray lightly with oil to help the panko brown.
Nutrition information is estimated based on common ingredients and serving sizes and may vary.

Nutrition

Calories: 420kcalCarbohydrates: 48gProtein: 18gFat: 16gSaturated Fat: 7gCholesterol: 160mgSodium: 850mgPotassium: 280mgFiber: 4gSugar: 6gVitamin A: 350IUVitamin C: 4mgCalcium: 300mgIron: 2mg
Keyword baked appetizers, mozzarella stick onion rings, stuffed onion rings
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