great idea 2 for 1

I do my tostada meat the night before - 

Dinner 1

1 1/2 lbs hamburger (or ground turkey) browned
taco seasoning
1 8 oz can tomato sauce
15 oz can kidney beans added at the end

I buy the tostada shells already fried. Add whatever you'd like on your tostada; cheese, tomatoes lettuce, dill pickles (yes, pickles!! don't knock it until you try it!!)

Night 2 - Hamburger soup 

Leftover meat/bean combo from the tostadas (you might want to do extra on night 1 so you have plenty)
1 can rotel diced tomatoes
1 15 oz can of tomato sauce
1 can of white beans - it was just what I had in the pantry
1 beef boullion cube dissolved in one cup hot water
I added three more cups of water
2 SAZON Goya seasoning packets

Cook all day low in the crockpot. Serve alone or with a grill cheese sandwich!!

This is very similar to the taco stew also just posted so it you are interested in stew and not soup, you could use your leftover tostada meat for that instead.