Roasted Chicken Tostadas

Name: Roasted Chicken Tostadas
Ingredients: 4 (6-inch) corn tortillas; Vegetable oil; 4 boneless, skinless chicken thighs (about 1 lb); Salt and freshly ground black pepper; Ground cumin; Ground coriander; 1/2 medium red bell pepper, cut into small cubes; 1/2 cup corn kernels (fresh or frozen & defrosted); 1/2 cup crumbled queso fresco or feta cheese; 2 scallions, chopped; 2 tablespoons fresh cilantro, finely chopped; For the guacamole:; 2 ripe Hass avocados; 1-1/2 tablespoons freshly squeezed lime juice; 1 clove garlic, very finely chopped; 1 medium tomato, seeded and diced; 1/4 cup fresh cilantro, chopped; Hot sauce to taste