1. Combine garlic, wholegrain mustard, Dijon mustard, and sour cream in a medium bowl. Mix well. Pour mixture in a baking dish that can fit into your Air Fryer basket.
2. Add the chicken and turn to coat all sides. Season with salt and pepper.
3. Preheat your Air Fryer to 380 F (190 C).
4. Cook the chicken 25-30 minutes or until chicken is cooked through, stirring occasionally.