Dice the chicken breast into small, even bite-sized pieces.
In a small mixing bowl, whisk together the chipotle peppers in adobo, lime juice, garlic powder, cumin, sea salt, and black pepper to create a marinade.
Heat the avocado oil in a large non-stick skillet over medium-high heat until shimmering.
Add the diced chicken to the skillet and sear for 5-6 minutes, stirring occasionally, until golden brown and cooked through.
Lower the heat to medium and stir in the black beans and the chipotle marinade, tossing for 2 minutes until the sauce thickens and coats the chicken.
In a separate dry pan or over an open flame, lightly toast the corn tortillas for 30 seconds per side until warm and pliable.
Divide the smoky chicken and bean mixture between the two tortillas.
Top each taco with the shredded cabbage and fresh cilantro before serving.