In a medium casserole dish place the left-over spaghetti Bolognese and spread evenly.
Combine the egg and egg whites and blend in the Parmesan cheese to the mixture.
Pour this egg-cheese mixture evenly over the top of the spaghetti Bolognese.
Spread the fresh mozzarella (or ricotta) over the spaghetti.
Saute and brown the ground beef with seasonings of choice.
In a large frying pan, heat 2 – 3 Tbsp. olive oil.
Add the chopped green pepper, minced garlic, chopped onion, and diced salami.
Cook for about 5 minutes.
Do not burn the garlic.
Add to the sautéed, seasoned and browned beef.
Spread the beef-vegetable mixture over the mozzarella.
Layer sliced mushrooms.
Layer the pepperoni.
Pour the pizza sauce on top and spread evenly.
Generously sprinkle the shredded cheeses over the top.
Place spaghetti on lower rack of pre-heated oven.
Bake for 45 minutes at 350 degrees, or until your preferred level of doneness, usually when the cheese is melted and golden brown.