In a shallow dish, mix Montreal Steak Seasoning, red wine vinegar, and olive oil.
Add chicken breasts, cover, and refrigerate for at least 30 minutes.
Preheat your oven to 350°F.
Remove chicken from marinade; cook it in a skillet over medium heat until done.
Chop the avocado, tomato, and onion into small pieces.
Set them aside to add later.
Place a tortilla on a flat surface.
Add cooked chicken, black beans, vegetables, and cheese.
Roll the tortilla tightly.
Place burritos in a baking dish and bake in the preheated oven for approximately 20 minutes.