In a large skillet, heat oil over medium heat. Add beef, sausage, celery, sweet red pepper and onion. Cook until meat is no longer pink and vegetables are tender, 6-8 minutes, breaking up meat into crumbles; drain. Return to pan. Stir in flour and seasonings until blended; gradually whisk in broth. Cook and stir until thickened, 3-5 minutes. Transfer to a large bowl; refrigerate for 30 minutes., Preheat air fryer to 360°. On a lightly floured surface, unfold puff pastry sheets. Cut each sheet into six 4-1/2x3-in. rectangles. Divide filling between centers of 9 pastry rectangles. Brush edges of pastry with beaten egg. Top with remaining pastry rectangles; press edges with a fork to seal. Prick tops with a fork and brush with beaten egg., In batches, place pies in a single layer in greased air fryer. Cook until golden brown, 10-12 minutes.