1. Cheese sauce: In medium saucepan, melt margarine.
2. Stir in flour.
3. Cook, stirring constantly (2 minutes).
4. Whisk in milk, black pepper and nutmeg;cook, stirring constantly, until mixture comes to a boil an thickens.
5. Remove from heat and stir in cheese; continue cooking until cheese melts and mixture is smooth.
6. Preheat oven to 350-degrees F.
7. Spray a 13 x 9 pan with cooking spray.
8. In medium bowl, combine spinach, broccoli, cannellini beans and red pepper.
9. Arrange 1/3 of the lasagna noodles (3 noodles) in prepared pan, spread with 1/3 of vegetable mixture; top with 1/3 of the cheese sauce.
10. Repeat layering twice, ending with cheese sauce.
11. Sprinkle reserved cheese and red pepper on top.
12. Cover with foil and bake 30 minutes; remove foil and bake 10 minutes longer.
13. Let stand 10 minutes before serving.