Preheat your air fryer to 375°F (190°C) for about 3 minutes.
Using a sharp knife, carefully cut a horizontal pocket into each chicken breast without cutting through the far side.
In a skillet over medium heat, sauté the garlic in a teaspoon of olive oil for 30 seconds until fragrant.
Add the chopped spinach and cook for 1–2 minutes until wilted. Remove from heat.
In a bowl, mix together the spinach, artichokes, cream cheese, Parmesan, mozzarella, and lemon juice.
Season the filling with a pinch of salt and pepper.
Stuff each chicken breast pocket with the filling, securing with toothpicks if needed.
Brush the outside of the chicken with the remaining olive oil and season with salt and pepper.
Place the stuffed breasts in a single layer in the air fryer basket. Cook for 12–15 minutes, flipping once halfway, until the chicken reaches 165°F (74°C).
Let the chicken rest for 3–5 minutes before serving to keep the juices inside.