Heat vegetable oil in a large pot. Add the onions and cook until softened, about 2 minutes. Add garlic and jalapeños and cook for another minute. Add Molcajete Mezcla.
Pour the chicken broth, tomatoes and beans into the pot and bring to a boil.
IF USING RAW CHICKEN BREASTS - Once at a boil, lower heat to a simmer and add your chicken breasts. Cook the chicken for 20-25 minutes. Once the chicken is cooked remove from the pot. When cool enough to handle shred and add back to the pot. IF USING ROTISSERIE CHICKEN - Shred the chicken and add it to the pot until heated through.