Bring a large pot of salted water to boil. Add the orzo pasta and cook according to package instructions until al dente, usually about 8-9 minutes. Drain the orzo and set aside.
In a large skillet, heat 1 tablespoon of olive oil over medium heat. Add the minced garlic and sauté for about 1 minute until fragrant, being careful not to burn it.
Reduce the heat to low and stir in the heavy cream and pesto sauce. Mix until fully combined and heated through, about 2-3 minutes. Season with salt and pepper to taste.
Add the shredded cooked chicken and cooked orzo to the skillet. Stir gently to coat everything evenly with the creamy pesto sauce.
Preheat your oven to 375°F (190°C). Transfer the orzo mixture into a greased baking dish. Scatter the halved cherry tomatoes evenly over the top. Then sprinkle the shredded mozzarella and grated Parmesan cheese generously across the surface.
Bake uncovered for about 20-25 minutes, or until the cheese is melted, bubbly, and golden brown on top.
Remove from the oven and let it rest for 5 minutes. Garnish with fresh basil leaves before serving.