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Preheat airfryer to 390° F for 5 minutes. 
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Cut mozzarella sticks in half to make 8 sticks. Add beaten egg to a second shallow bowl and flour in a third bowl. 4 mozzarella cheese sticks, 1 large egg, ¼ cup flour 
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To a small, shallow bowl, combine panko, garlic powder, and salt. 1 cup panko, 1 teaspoon garlic powder, ½ teaspoon salt 
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To another small bowl, add an egg and beat until frothy. 
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To a third small bowl, add the flour. Make an assembly line. 
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Roll mozzarella sticks in flour, then dip in egg, turning to cover all sides. Place into panko, covering with a spoon and pressing cheese firmly into panko. 
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Repeat this process twice with each mozzarella stick. Place on paper plate or parchment lined, freezer safe dish and freeze for 15 minutes. 
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Place mozzarella sticks into air fryer basket and spray or brush with oil. Cook 5 minutes or until golden brown. Air fryer cook times vary so check after 5 minutes – you may need 6-8 minutes. olive oil 
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Serve with dipping sauces. marinara sauce or ranch