Bring a large pot of lightly salted water to a boil. Cook lasagna noodles for 8 to 10 minutes, or until al dente. Drain, rinse with cold water, and set aside.Preheat oven to 350 degrees F (175 degrees C)
While the pasta is cooking, heat a large pan to medium/high heat. Toss in onions and cook for 3-5 minutes, until golden and soft. Add bell peppers and cook for another minute. Next add garlic and spices and cook for just 30 seconds. Turn heat off.
Add shredded chicken, chopped spinach, cream cheese, 1 cup mozzarella, and 1/4 cup parmesan to the cooked veggies (while heat is off) and throughly combine with a spatula (you can also do this in a large bowl).
Spread 1/3 of spaghetti sauce in the bottom of a 9x13 inch baking dish. Cover with the chicken mixture, and top with 3 lasagna noodles; repeat. Top with remaining sauce, and sprinkle with remaining mozzarella cheese.
Bake for 35-45 minutes or until the cheese is fully melted and the edges are brown and bubbly.