Cook 1 lb boneless skinless chicken breast in 1 tbsp olive oil for 5-7 min or until almost done add ½ cup green pepper and ½ cup sweet onion. Cook until tender.
Cook 1 lb penne pasta.
Add chicken, green peppers and onions too Penni pasta.
Cook 1 stick of butter or margarine until melted, add 2 handfuls of flour to make a paste, cook approx 3-5 minute Add 2 cloves of garlic, minced; cook 3-5 min more. Add 2 cups of milk and bring to boil, stirring constantly. Cook until is consistency of a sauce for pasta, approx 10-15 min stirring frequently (I use a wire whisk).
Add pasta and chicken to sauce, add lemon zest, salt and pepper and a pinch of nutmeg.
Bake in a 375°F oven for 15 minute add ½ cup of Parmesan cheese and bake another 10-15 min covered.
I add grated cheese sometimes at the end of baking for a more cheesy taste.