Preheat your oven to 400 degrees Fahrenheit.
Place the whole wheat naan flatbreads on two baking sheets, ensuring they are evenly spaced.
Spread a thin layer of marinara sauce over each flatbread, leaving a small border around the edges.
Spoon 1 teaspoon of pesto onto each flatbread, spreading it evenly.
If you're including cheese, sprinkle shredded mozzarella over the pesto layer.
Distribute the chopped yellow bell pepper, halved cherry tomatoes, sliced red onion, and sliced mushrooms evenly across the flatbreads.
Add the shredded grilled chicken breast on top of the vegetable mixture.
If desired, place whole basil leaves on the pizzas for added freshness and flavor.
Place the prepared flatbreads in the preheated oven and bake for approximately 12 minutes or until the edges are golden and the cheese is melted.
Remove the Runner's Pizzas from the oven and let them cool for a few minutes before slicing.