I use crock pot liners for easy clean up! So either line your slow cooker or grease bottom and sides with Pam cooking spray.
Cook ground beef until no longer pink (and crumbly) with onion and garlic. 8-10 minutes
Add 1 jar of sauce to ground beef mixture
Take 2nd jar of sauce and cover bottom of slow cooker with 1 cup of sauce.
Mix 1.5 cups of mozzarella cheese, parmesan cheese, Italian seasoning and egg until thoroughly blended.
Place uncooked pasta over the sauce so that it covers the bottom. Then place a third of the meat mixture on top.
Place a third of the cheese mixture on top of the noodles and meat. Repeat this sequence three times.
End with a layer of noodles on top and cover with remaining sauce. Sprinkle with the last 1/2 cup of mozzarella and fresh parsley.
Cook on low for 5 hours and enjoy!!