Prepare the ingredients. Finely chop the onion and garlic.

Slice the bell pepper and jalapeño into thin strips. Cut the Swiss chard into thin strips.

Chop the tomato. Cut the chicken strips into cubes. Heat the oil in a skillet over medium heat. Add the chicken and season with salt, pepper, and cumin.

Sear the chicken on all sides, then transfer to a plate and keep warm. In the same skillet, sauté the onion until translucent. Add the garlic and cook until fragrant.

Add the bell pepper and jalapeño and cook until they begin to soften. Add the tomato and Swiss chard, stir, cover, and cook over medium heat until the Swiss chard softens.

Return the chicken and any juices to the skillet. Mix well, let the flavors combine, and cook until the chicken is fully cooked. Adjust seasoning with more pepper and cumin if desired.