Place the hazelnuts in a bag and roughly break them up with a rolling pin.
Take three flat bowls. Place the flour in the first bowl and season with salt and pepper. Beat the egg in the second bowl and mix together the breadcrumbs and crushed hazelnuts in the third bowl.
Dip the chicken tenders first into the seasoned flour, then the eggs, and finally into the breadcrumb and hazelnut mix.
Put the dipped tenders onto a baking tray lined with baking parchment and bake for 15-20 minutes at 220°C or 450°F.
Whilst the chicken is baking, place all of the ingredients for the sauce into a pan and bring to a boil.
Reduce the heat to low-medium and simmer for 5 minutes.
To Cook in an Air Fryer:
Spray the basket of the air fryer with spray oil.
Place the chicken goujons in the basket in a single layer and cook for 12-15 minutes at 200°C or 400°F, flipping halfway through.
Notes
Ensure that the chicken reaches 73°C or 165°F before serving.