Preheat the Oven to 375°
In a stock pot, add the olive oil, then saute the slivered onions, diced pepper, and minced garlic over medium heat for 5 minutes, or until soft.
Pour in the chicken broth, then stir in the cumin and diced tomatoes. Let simmer for about 15 minutes. (I don't usually time it, I just let it simmer until the rest of the recipe is complete.)
Meanwhile, slice the tortillas into strips or cut into sixths to make chips. Arrange them evenly on a baking sheet, and bake for 10-15 minutes, or until crispy. Check them near the end a few times to ensure they don't burn.
While the tortillas are cooking, In a separate pan, cook the chicken breasts in a little oil until fully cooked, then sear slightly to give them a little color. Then remove them from the pan and cut or shred them
Add the chicken and lime juice to the soup.
Serve the soup with any optional toppings such as sour cream, cilantro, shredded cheese, and the tortilla strips.