Saute pepper, mushrooms, garlic, and onion in a little olive oil until tender.
Melt the butter over medium heat.
When it starts to bubble, add flour and salt and mix to a smooth paste.
Stirring constantly, slowly add half and half, cream, and cheese (except mozzarella) keeping it smooth.
Stir until thickened. Add onion mixture and albacore.
Mix into cooked pasta and spoon into a buttered casserole.
Sprinkle with mozzarella.
(to freeze stop here, seal and freeze. Thaw overnight in the refrigerator before baking)
Bake at 375 for 30 minutes.