Melt the butter in a small sauce pan. Add the flour and cook, stirring frequently for 2 minutes or so. Add the milk slowly whisking constantly to keep things smooth.
Bring the mixture just to a boil, stirring constantly. Remove the pan from the heat and stir in the Parmesan cheese. Set aside in a warm place. If sauce gets too thick add a little more half & half.
Cook the lasagna according to the package directions. Drain well and lay out on wax or parchment paper. Prepare the filling while the pasta cooks.
Heat the olive oil in a large skillet. Add the onion and cook for 3 minutes. Add the bell peppers and mushrooms and cook another 3 minutes. Stir often during this step to insure everything is softening.
Add the garlic and artichoke hearts and cook 3 minutes more or until everything is soft, fragrant, and lightly browned. Allow to cool before adding to the other filling ingredients.
In a large bowl, combine the ricotta, eggs, pesto, and 1/3 cup of the Italian Cheese Blend. Mix everything together. Add the cooled vegetables and stir it all together.
Spray a baking dish with non-stick spray. Place 2 lasagna noodles in the bottom of the dish. Spread half of the filling evenly over the noodles. Sprinkle with a little of the remaining cheese blend and drizzle a tablespoon or two of the Bechamel over the layer.
Repeat the process with two more noodles and the other half of the filling. Sprinkle with cheese and drizzle with sauce as for the first layer.
Top with the remaining two noodles. Spread the rest of the Bechamel sauce on top and sprinkle with the last of the cheese blend.
Cover loosely with foil and bake in a pre-heated 350 degree oven for 30 minutes. Check to see if things are beginning to bubble. If not cover and bake another 5 minutes or so.
When the lasagna is bubbly, remove the foil and raise the oven to broil. Broil the lasagna for 3 - 4 minutes or until it is lightly golden brown and even more bubbly.
Allow to rest 10 -15 minutes before cutting and serving.