In a large bowl, combine olive oil, harissa, garlic, paprika, cumin, salt and pepper. Add the chicken to the spice mix and mix well to incorporate. Refrigerate for at least 2 hours or overnight.
Heat a large saucepan on medium without any oil, then transfer the chicken from the bowl to the saucepan. Cook until the chicken is well done, about 8-10 minutes. When it’s cooked, squeeze some fresh lime juice on top of the chicken.
Serve over rice with a lime wedges and fresh mint, if desired. Due to the spice level, plain yogurt also works really well with the recipe.