01 - Preheat oven to 400°F. Lightly grease a large baking dish with cooking spray or butter.
02 - Bring a large pot of salted water to a rolling boil. Add the pasta and cook until just al dente according to package directions. Drain well and set aside.
03 - While the pasta cooks, heat olive oil in a large skillet over medium heat. Season the chicken pieces with salt and pepper, then add to the skillet. Sauté for 5 to 6 minutes, turning occasionally, until golden brown and cooked through to an internal temperature of 165°F. Remove from heat and set aside.
04 - In a large mixing bowl, toss together the drained pasta, cooked chicken, basil pesto, heavy cream, minced garlic, and chopped sun-dried tomatoes. Stir until every piece is evenly coated with the sauce.
05 - Transfer the pasta mixture to the prepared baking dish, spreading it into an even layer. Scatter the shredded mozzarella evenly across the top, then finish with a generous dusting of grated Parmesan.
06 - Place in the preheated oven and bake for 20 minutes, or until the cheese is melted, bubbly, and golden on top.
07 - Remove from the oven and let the bake rest for 5 minutes so the sauce settles. Garnish with fresh basil leaves if desired, then serve warm.