For the chicken: Put the chicken in a resealable bag. In a bowl, mix together the cumin, chili powder, crushed pepper, garlic powder and 1/2 teaspoon each salt and pepper; pour over the chicken. Seal the bag and smush to coat.
Add the oil to a skillet and heat it up over medium-high heat. Add the chicken and cook until cooked through, about 4 minutes per side. Remove the chicken to a cutting board, cut into cubes, and then return to the skillet; keep warm over low heat, covered in foil.
For the tortillas: Wrap the tortillas in foil and warm them in the oven for 15 minutes. Serve the chicken with the tortillas as part of a taco bar.
Avocado Lime Crema:
Add the avocados, cilantro, sour cream, milk, salt, pepper and lime zest and juice to a blender. Blend until smooth. Serve as part of a taco bar.
Basic Brown Beans:
Add the beans, chili powder, 1 1/2 teaspoons salt and 2 teaspoons pepper to a large pot. Add cold water to cover by 2 inches. Bring to the boil, reduce the heat and simmer, covered, until tender, about 6 hours. Serve as part of a taco bar.
Grilled Mini Peppers:
Heat up a grill pan and slap the peppers on. Cook, turning them occasionally, until blistered on all sides and softened, about 8 minutes total. Remove and set aside. Serve as part of a taco bar.
Mango de Gallo:
Add the jalapenos, tomatoes, onions, mangoes, cilantro, lime juice and salt to a bowl and stir together. Serve as a taco bar fixing.
In a blender or food processor (see Cook's Note), combine the diced tomatoes, whole tomatoes, cilantro, onions, garlic, chiles, hot sauce, cumin, salt, sugar and lime juice. Pulse until you get the salsa to the consistency you like; I do about 10 to 15 pulses. Test seasonings with a tortilla chip, if you dare. Refrigerate for at least an hour before serving.
I recommend using a 12-cup food processor, as this recipe makes a large quantity. Alternatively, you can blend or process the ingredients in batches and then mix everything together in a large mixing bowl.