Preheat your oven to 400°F (200°C).
Place the pastry crust into a tart pan and prick the bottom with a fork.
Cook the chicken breasts on a grill or skillet until they are cooked through, about 6-7 minutes per side.
Let the chicken rest for a few minutes, then slice it thinly.
Spread the basil pesto evenly on the pastry crust.
Layer the sliced chicken over the pesto, followed by halved cherry tomatoes and shredded mozzarella cheese.
Sprinkle grated Parmesan cheese over the top and season with salt and pepper.
Bake the tart in the preheated oven for 25-30 minutes, or until the cheese is bubbly and the crust is golden brown.
Remove from oven and let cool slightly before garnishing with fresh basil leaves.
Slice and serve warm, enjoying the medley of flavors.