Braised Ranchero Chicken

Name: Braised Ranchero Chicken
Ingredients: 1 green bell pepper; 1 red bell pepper; 1 poblano pepper; 1 dried guajillo chile; 1 dried pasilla chile; 3 tablespoons olive oil or vegetable oil; 3 medium Spanish onions, coarsely chopped; 2 teaspoons ground cumin; 2 teaspoons chili powder; 1 teaspoon dried oregano, preferably Mexican; 1/2 teaspoon dried thyme; 1 teaspoon ground black pepper; 1 tablespoon kosher salt; 6 to 8 garlic cloves, sliced; Two 28-ounce cans chopped tomatoes; Two 6-ounce cans chopped green chiles; 1 tablespoon sugar; 4 pounds skinless boneless chicken thighs; 2 cups chicken stock; 2 teaspoons kosher salt; 1 teaspoon ancho chili powder; 1 teaspoon ground cumin; 1 teaspoon garlic powder; 1 ounce fresh squeezed lime juice; 1 teaspoon freshly ground black pepper; Vegetable oil, for frying; 6 to 8 corn tortillas; Avocado slices, for serving; Grated queso fresco, for serving