In a medium saucepan, combine the rinsed quinoa and chicken broth. Bring to a boil, then reduce heat to low, cover, and simmer for about 15 minutes or until the quinoa is fluffy and liquid is absorbed. Fluff with a fork and set aside.
While the quinoa cooks, heat olive oil in a skillet over medium-high heat. Season the chicken breasts with cumin, paprika, salt, and pepper.
Place the chicken in the hot skillet and cook for about 6-7 minutes on each side or until cooked through and golden brown. The internal temperature should reach 165°F (75°C).
Once the chicken is done, remove it from the skillet and let it rest for a few minutes. Slice the chicken into strips.
In a large mixing bowl, combine the cooked quinoa, lime juice, lime zest, chopped cilantro, halved cherry tomatoes, and diced avocado. If using, add the diced jalapeño for an extra kick. Toss gently to combine.
Serve the quinoa mixture on a plate and top with the sliced chicken. Garnish with additional cilantro if desired.