Preheat the Oven. Preheat your oven to 375°F. Grease a 9x13-inch baking dish with cooking spray and set aside.
Prepare the Chicken. In a skillet, heat olive oil over medium heat. Add shredded chicken, garlic powder, onion powder, salt, and pepper. Cook until the chicken is heated through and well-coated with the seasonings. Remove from heat and set aside.
Make the Sauce. In a saucepan, combine marinara sauce, diced tomatoes, minced garlic, dried oregano, dried basil, salt, and pepper. Simmer for 10 minutes, allowing the flavors to meld together. Remove from heat and set aside.
Prepare the Cheese Mixture. In a mixing bowl, combine ricotta cheese, shredded mozzarella cheese, grated Parmesan cheese, egg, and chopped parsley. Mix until well combined.
Assemble the Lasagna. Spread a thin layer of the sauce mixture on the bottom of the prepared baking dish. Arrange 4 cooked lasagna noodles on top. Spread half of the chicken mixture over the noodles, followed by half of the cheese mixture. Repeat the layers, ending with a layer of sauce.
Bake the Lasagna: Cover the baking dish with aluminum foil and bake in the preheated oven for 30 minutes. Remove the foil, sprinkle the remaining shredded mozzarella cheese over the top, and return to the oven. Bake uncovered for an additional 15 minutes, or until the cheese is melted and bubbly.
Serve. Remove the lasagna from the oven and let it cool for a few minutes. Garnish with fresh basil leaves before slicing and serving.