Cook chicken breasts until fully done (simmer about 20 minutes or slow cook 4 hours on low).
Shred the cooked chicken with two forks in a large mixing bowl.
Mix the shredded chicken with half the jar of salsa and the taco seasoning until evenly coated.
Warm corn tortillas (about 30 seconds in the microwave wrapped in a damp paper towel) so they roll without cracking.
Place about 1/3 cup of chicken mixture down the center of each tortilla, add a spoonful of black beans, then roll tightly.
Arrange rolled enchiladas seam-side down in a greased 9x13 baking dish.
Pour the remaining salsa over the enchiladas, dollop the Greek yogurt on top, and spread gently.
Bake at 350°F for 25 minutes, until bubbly and lightly golden.
Cool the dish for 30 minutes for safe storage and better texture.
Portion into individual glass meal prep containers (one or two enchiladas per container) and label with the date.