Place rice in a large saucepan; add warm broth a ladle at a time, stirring constantly until absorbed before adding more, about 20-25 minutes total.
When rice is creamy and tender, remove from heat; stir in butter, Pecorino, pepper, and one beaten egg until combined.
Spread on baking sheet; refrigerate at least 2 hours or until completely cooled and firm.
Shape chilled risotto into 2-inch balls by hand on parchment-lined baking sheet.
Set out three shallow bowls: flour, remaining 2 beaten eggs, and breadcrumbs.
Roll balls in flour, dip in egg, then coat thoroughly in crumbs.
Preheat air fryer to 375°F; spray basket with cooking spray.
Arrange balls in single layer; spray tops. Cook 12-15 minutes until golden brown and crispy, turning halfway.
Cool 3-4 minutes before serving.