Preheat oven to 350 °F (177 °C) and line a large baking sheet with parchment paper.
Combine chicken, pesto, panko, salt, and pepper in a bowl and mix with hands until uniform. Using a heaping teaspoon, lightly shape mixture into 3/4 inch round meatballs (about 28 meatballs).
Place meatballs on prepared baking sheets and bake for 8-10 minutes until meatballs are just cooked through. Remove from oven and set aside.
Cook pasta in a large pot according to directions on the package. Reserve 1 cup of pasta water. Drain well then add pasta back into the large pot.
2 cups uncooked O-shaped pasta
Add marinara sauce to the pot along with the meatballs and stir to incorporate. If the mixture is too thick, use the reserved pasta water to thin it out, ¼ cup at a time until desired consistency.
1 1/2 cups marinara sauce
Season with additional salt and pepper, to taste, and serve with fresh parmesan cheese on top and fresh basil.