Combine ingredients for chicken in a gallon zipper bag. Place in refrigerator and let marinate for at least 4 hours (up to over night)
Preheat oven to 375degF.
Place chicken breasts on baking rack on a parchment paper baking sheet. Bake in oven for 30 minutes (or until thickest part of the chicken reaches 165degF).
In a sauce pan over medium-low heat, add black beans, cumin, chili powder and one tablespoon of lime juice. Let simmer while chicken in cooking.
In a mixing bowl, combine onion, cilantro, jalapeno, and remaining lime juice.
Once cooked, remove chicken from oven and chop.
Smear half of tortilla with sour cream. Add portion of chicken, black beans and then onion mixture. Sprinkle with queso fresco. Repeat with remaining tortillas.
Keyword black beans, chicken tacos, lime, tacos, white onion