In a large pot or dutch oven, heat the oil on medium heat. Add in the tomatoes and cook until browned, about 10 minutes. Add in the onion, garlic, and cook until softened, 5-7 minutes.
1 tablespoon olive oil, 4 roma tomatoes, 1 large yellow onion, 2 garlic cloves
Add in the oregano and cumin, cooking until fragrant. About 1-2 minutes.
1 teaspoon Mexican oregano, ½ teaspoon ground cumin
Stir in the bay leaves, chicken broth, salt and pepper. Add in the chicken and bring the mixture to a simmer.
2 bay leaves, 2 cups chicken broth, ½ teaspoon salt, pepper to taste, 2 pounds chicken breasts
Cover and simmer until the chicken is cooked through, 20-30 minutes. Set the chicken aside.
Add the chipotle peppers to the pot and using an immersion blender, blend until smooth.
2 tablespoons chipotle peppers in adobo
Shred the chicken and return it to the pot. Stir until combined and warmed through.