In a large shallow bowl, combine lime juice, oil, garlic, cumin, salt, chili and cilantro; mix together. Add the chicken thighs and If time allows, let marinate for 30 minutes.
Heat a large skillet or pan (12-inch | 30cm) on medium-high heat until smoking. Add a drizzle of olive oil to lightly coat the bottom of the pan. Sear the chicken on both sides until golden, charred and cooked right through (about 8 minutes per side, depending on the thickness of your fillets). Flip them a couple of times while cooking so they get a nice even char.Transfer chicken to a warm plate, loosely tent with foil and let rest.
Add the peppers to the skillet (drizzle with a little extra oil only if needed), and cook until soft and slightly charred. Season with salt and pepper.
For Rice:
While the chicken is marinading or cooking, cook rice: Combine together the rice, chicken stock (or broth), and garlic in a pot over high heat. Mix well and bring to a boil. Reduce heat and cover with a lid until the rice is cooked through.
Fluff up rice with a fork and mix through lime juice and cilantro. Season to taste with salt and pepper, if needed.
Dressing:
Whisk dressing ingredients together to combine.
Assembly:
Combine lettuce, beans, corn, onion and peppers into 4 bowls. Slice chicken into strips and arrange into bowls. Top each with avocado slices and drizzle with dressing.
Notes
Tip: To keep your burrito bowl low carb, swap out the rice for cauliflower rice.