How to Make It
Preheat broiler to high.
Heat oil in a large ovenproof skillet over medium-high. Add onion, bell pepper, corn, salt, and pepper to pan; sauté 3 minutes or until crisp-tender. Add beans, tomatoes, stock, and juice; cook 2 minutes. Top vegetable mixture with chicken; sprinkle evenly with cheese.
Place pan in oven; broil 3 minutes or until cheese melts.
Heat tortillas according to package directions. Divide chicken mixture evenly among tortillas; top each with 1 teaspoon sour cream and 1 avocado slice.