To make delicious Chicken Black Bean Tacos, follow these clear steps:

1. Heat Oil: In a large skillet, heat the olive oil over medium heat.
2. Cook Onions: Add the chopped onion and sauté for about 3-4 minutes until softened.
3. Add Garlic: Stir in the minced garlic and cook for an additional minute until fragrant.
4. Sauté Chicken: Add the diced chicken breast to the skillet. Cook until the chicken is no longer pink, about 6-8 minutes.
5. Season: Sprinkle the cumin, chili powder, smoked paprika, salt, and pepper over the chicken. Stir until the chicken is well-coated with the spices.
6. Incorporate Beans: Gently mix in the rinsed black beans, and allow everything to heat through for 2-3 minutes.
7. Warm Tortillas: While the chicken and beans finish cooking, warm the tortillas on a separate skillet or in the microwave until pliable.
8. Assemble Tacos: On each tortilla, layer a generous portion of the chicken and black bean mixture.
9. Add Toppings: Top with shredded lettuce, diced tomatoes, shredded cheese, and a dollop of sour cream if desired.
10. Garnish: Sprinkle with cilantro and add jalapeños for an extra kick before serving.

Following these steps will lead you to a plate of Chicken Black Bean Tacos that are both delicious and easy to prepare!