Cut the tops off the bell peppers and remove the seeds and membranes. Place the peppers upright in a baking dish.
In a large bowl, mix together the shredded chicken, basil pesto, cooked quinoa or rice, cherry tomatoes, half of the mozzarella cheese, olive oil, salt, and pepper until well combined.
Stuff each bell pepper generously with the chicken and pesto mixture, pressing down gently to pack it in.
Top the stuffed peppers with the remaining mozzarella cheese.
Cover the baking dish with aluminum foil and bake for 25 minutes.
Remove the foil and bake for an additional 10-15 minutes or until the peppers are tender and the cheese is bubbly and golden.
Once done, remove from the oven and let cool for a few minutes.
Garnish with fresh basil leaves before serving.
Notes
Feel free to customize the filling with your favorite vegetables.