COOK lasagne noodles according to package directions.
COMBINE ricotta cheese, spinach, eggs, and red pepper. Season to taste.
MELT butter in saucepan over medium heat; cook onion and garlic 2 to 3 minutes. Stir in flour, then milk. Cook and stir until bubbling and thickened. Stir in 1/2 of the Parmesan cheese.
POUR 1/2 cup sauce over bottom of greased 13x9x2-inch baking pan. Top with 1 layer of 4 lasagne noodles, overlapping edges slightly.
LAYER with 1/2 spinach mixture, and 1/2 of the mozzarella cheese. Repeat layers. Top with last 4 noodles.
POUR remaining sauce evenly over lasagne; sprinkle with remaining Parmesan cheese. Bake in 350°F oven for 35 minutes. Let stand 10 minutes before serving.
serving size = 1/12 recipe