Heat olive oil in a large skillet over medium heat
Season chicken thighs with salt and pepper
Add chicken thighs to the skillet and cook for 5–6 minutes on each side until golden brown and fully cooked (internal temperature of 165°F or 74°C)
Remove chicken from the skillet and set aside
In the same skillet, add garlic (if using) and sauté for 30 seconds until fragrant
Add sliced carrots and cook for 3–4 minutes until they begin to soften
Stir in peas and cook for an additional 2–3 minutes until heated through
Return chicken to the skillet and toss with the vegetables
Squeeze fresh lemon juice over the dish for brightness
Season with more salt and pepper if desired
Serve warm