I bought 10 lbs of ground beef at Aldi last week and I was really looking up against browning it all. So I googled "browning ground beef crockpot" and found a really easy way to do it.
I was able to put 5 lbs at a time in my crockpot. I crumbled it up, added about a cup of water and turned it on high. I tried to mix it up with my Pampered Chef Mix n Chop every 45 min to an hour because it would start to really brown around the edges.
About 3 hours later, I had 5 lbs of browned beef with no splatters on my stove! I stuck the beef in a colander to drain and then added my other 5 lbs to the crockpot. It takes longer than browning it on the stove, but I think there is less mess and I don't have to stand and watch it, just stir it occasionally. Today I've made 6 lbs into taco meat and sloppy joes (all in the crockpot!) and am going to make chili and shepherd's pie with the rest.