Line 1/2 your air fryer basket with baking paper so the spinach won't fall through the holes. Cover with frozen spinach in a single layer. Place chicken on the wire next to the spinach making sure the chicken is spread out in a single layer.
Set the air fryer to 200C (400F). Cook for 10 minutes.
When the timer goes, check the chicken. - it may need a few minutes longer depending on how thick the fillets were.
for OVEN
Turn your oven to 250C (480F). Line a rimmed baking sheet with paper.
Place chicken on the tray. Place the frozen spinach next to the chicken.
Pop tray in the oven and set your timer for 12 minutes. Put your feet up.
When the timer goes, check the chicken. - it may need a few minutes longer depending on your oven.
To serve (both methods)
Mix the delicious double cream in a small bowl with a pinch of salt.
When the chicken. is cooked and the spinach is hot, remove from the oven. Place spinach on a plate and swirl through the cream. Top with hot chicken.