Creating Pesto Chicken Flatbread is simple when you follow these easy steps:

1. Preheat the Oven: Begin by preheating your oven to 400°F (200°C).
2. Prepare the Chicken: Season the chicken breasts with salt and pepper. Drizzle with olive oil and coat with 1/4 cup of pesto sauce.
3. Cook the Chicken: In a skillet over medium heat, cook the chicken for 6-7 minutes on each side or until fully cooked. Remove from heat and let it rest.
4. Slice the Chicken: Once cooled, slice the cooked chicken into thin strips.
5. Prepare the Flatbreads: Place the flatbreads or naan on a baking sheet lined with parchment paper.
6. Assemble: Spread the remaining pesto sauce evenly over the flatbreads. Top with sliced chicken, shredded mozzarella cheese, cherry tomatoes, red onion, and spinach.
7. Bake: Transfer the baking sheet to the oven and bake for 15-20 minutes, or until the cheese is melted and bubbly and the edges of the flatbreads are golden brown.
8. Garnish: After removing from the oven, transfer to a serving platter. Garnish with fresh basil leaves if desired.
9. Slice and Serve: Cut the flatbread into slices for easy serving.