Healthy Chicken Fajita Stuffed Peppers

Name: Healthy Chicken Fajita Stuffed Peppers
Ingredients: 12 ounces boneless skinless chicken thighs, cut into bite-size pieces; 2 teaspoons chili powder; 1 teaspoon ground cumin; Kosher salt and freshly ground black pepper; 2 tablespoons canola oil; 1 large white onion, thinly sliced; 2 cups cooked brown rice; 1 cup shredded Mexican blend cheese; Juice of 1 large lime; 4 medium bell peppers, halved through the stem and seeds removed (1 each green, red, yellow and orange); A handful cilantro leaves with tender stems; 2 tablespoons sour cream; 1/2 cup guacamole, optional; 1/2 cup pico de gallo, optional