Italian Crock Pot Lasagna Recipe

Lasagna Ingredients:

2 pounds of cooked ground hamburger meat

1/2  of chopped onion

2 jars of marinara sauce 

1/2 box of uncooked lasagna noodles

1 (2 pounds) tub of ricotta cheese

2-3 cups of mozzarella cheese

1 beaten egg 

1/2 tsp of salt