In a separate sauce pan, begin browning ground beef over medium high heat.
Add onions, bell peppers, and mushrooms. Cook for 7 more minutes or until beef is browned and onions are clear.
Add ½ cup pepperoni and cook for 2 more minutes.
Add pizza sauce and crushed tomatoes. Let simmer covered over medium heat for about 10 minutes.
Add pasta to boiling water and cook while sauce simmers. Drain pasta once cooked and add to meat sauce and stir to combine.
Pour pasta and meat sauce mixture into a casserole dish. Top with shredded cheese and remaining pepperoni and bake at 350 for 10 minutes or until cheese is melted. Top with fresh chopped parsley and let cool a few minutes before serving.
Recipe by Mandy's Recipe Box at https://mandysrecipeboxblog.com/pizza-pasta-bake/