In a large skillet, heat the olive oil and cook the peppers and onions until tender.
1 tablespoon olive oil, ½ cup green pepper, ½ cup onion
Add the ground beef, season with salt, pepper, and granulated garlic.
1 lb lean ground beef, 2 teaspoons garlic powder, Salt and Pepper
Drain off excess grease.
Stir in the tomato sauce and simmer for 5 minutes.
3 15oz cans tomato sauce
In a mixing bowl, combine 1 cup of the mozzarella cheese with the basil and grated parm and ricotta cheeses. Mix until well combined.
2 cups mozzarella cheese, 1 15oz container ricotta cheese, 1 cup Parmesan & Romano cheese, 2 teaspoons dried basil
The remaining mozzarella cheese will be for the top of the lasagna just before serving so place that back in the refrigerator.
2 cups mozzarella cheese
Spoon a fourth of the meat sauce into the bottom of the slow cooker.
Break 5 noodles and place them on top.
15 lasagna noodles
Spread half the cheese mixture on top of the noodles. Repeat the layers, ending with sauce on the top.
Set the slow cooker to low, cover and cooker for 4-6 hours until the noodles are tender.
About 10 minutes before serving, top with remaining mozzarella cheese, cover and let stand until the cheese is melted.