I must say I was fairly curious about the concept of a crockpot lasagna. It's not really something you need to slow cook for many hours? Why use a crockpot? I guess it would be a good idea if you didn't want to heat up the whole house with a stove. I talked with Jill over brunch a while back about her issues with a similar recipe, she had problems with the noodles burning on the edges, so I kept a close eye on it and poked it every now and then to make sure it was neither overcooking nor undercooking. The result was rather tasty. I cooked mine for 3.5 hours, but the base noodles were a tad soft, so I suggest cutting it down to 3 hours.
1 lb. uncooked lean ground beef (4% fat)
1 small onion, diced