Finely dice the yellow onion and mince the garlic cloves.
Heat the olive oil in a medium skillet over medium heat, then add the onion and cook until translucent, about 5 minutes.
Stir in the minced garlic, cumin, and smoked paprika, cooking for 1 minute until fragrant.
Add the chicken breast, tomato puree, and chipotle peppers in adobo sauce to the skillet.
Reduce heat to low, cover, and simmer for 15-20 minutes until the chicken is fully cooked and tender.
While the chicken simmers, steam the cauliflower rice in a separate pan with a splash of water until tender, then stir in the lime juice.
Remove the chicken from the skillet and use two forks to shred it into bite-sized pieces.
Return the shredded chicken to the sauce and stir to combine, seasoning with sea salt and black pepper.
Warm the black beans in a small saucepan or microwave until heated through.
Serve the shredded chicken over the cauliflower rice and black beans, garnished with fresh cilantro.