Chicken Tortilla Soup

I think my mom got this recipe from my cousin. It was really easy and good. Mike even ate it, probably because I left out the onions and didn't make him eat an avacado with his soup.
Serves 8-10 (I made half and we'll have lots of leftovers)
4 chicken breasts
1 t. olive oil
1 t. minced garlic
1/2 t. cumin
4 cans chicken broth
2 c. onion
1 t. chili powder
2 T. lemon juice
1 c. salsa
Cook all of the above ingredients in a crockpot on low for 6-8 hours. A couple hours before serving, shred the chicken breasts and add:
1 can corn
1 can black beans
2 T. cilantro
Return to crockpot to cook.
Serve with a handful of crushed tortillas on top, as well as guacomole, sour cream, or a fresh avacado.