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Preheat oven to 400 degrees F and grease a 9×13-inch baking dish.
In a large bowl, add pasta, chicken, pesto, tomatoes, spinach, olive oil, lemon juice, 1 ½ cups mozzarella, red pepper flakes, salt, and pepper. Stir until well combined.
Transfer mixture to the prepared baking dish and sprinkle remaining ½ cup mozzarella and parmesan cheese on top.