Stupid Slow Cooker Black Bean Soup

Why is it stupid soup?  Because it's stupidly easy to make and I feel stupid for a) not thinking of it before and b) for thinking it wouldn't turn out to be great.  Because it turned out to be great!

Years ago, I used to make an easy black bean soup by boiling canned beans, tomatoes, sauteed garlic and onions, and beef broth on the stove.  It was sooo good.  I don't know why I stopped making it.  I also don't know why I never thought to use salsa instead of canned tomatoes!  Way more flavor, much less work.  Such a duh moment.  This version might actually be better, and with only four ingredients and no prep work at all, I'd call it a winner.

Recipe
1- 15 oz bag dry black beans
2 cups prepared salsa
6 cups beef broth
1 T Old Bay seasoning (may substitute chili powder)

Place all ingredients in slow cooker.  Cook on high for 4 hours.