Brown beef with onion & garlic. Drain fat. In bowl mix together ricotta cheese, 1 1/2 cups mozzarella, salt, pepper, Italian seasoning & eggs.
Lightly spray crock with cooking spray. Pour enough sauce to just cover bottom of dish. Break noodles to fit crock as completly as possible as your bottom layer. Spread a layer of cheese mixture (1/3) onto pasta, then 1/3 of beef mixture, next pasta sauce (be generous). Repeat layers until finished. Top with remaining cheese.
Cook low 5-6 hours until pasta is al dente. Be sure to check after 5 hours as to not overcook.