In a large mixing bowl, whisk together the alfredo sauce, lemon juice, and pepper until evenly combined. Add the chicken, spinach, and peppers- again stirring until evenly combined.
Lightly coat a 9x13" baking dish with non stick cooking spray. Layer 3 of the lasagna noodles evenly out over the bottom. Evenly spread with 1/3 of the chicken mixture out over the noodles.
Sprinkle 1/3 of the Italian cheese evenly out over top. Repeat the layers twice, and finish off with the remaining cheese.
Cover the dish with tinfoil and bake at 325 degrees for 50-55 minutes.
In a small bowl, stir together the bread crumbs, Parmesan cheese, and butter until evenly combined. Uncover the lasagna, sprinkle this mixture evenly out overtop, and return to the oven. Bake an additional 5-10 minutes, or until the bread crumbs and cheese are lightly toasted.
Let the lasagna rest for 10-15 minutes before slicing and serving.