Peel the sweet potato and cut into 1-inch cubes.
Place sweet potato cubes in a pot of boiling water and cook until tender, about 10-12 minutes.
While potatoes boil, season the chicken thighs with sea salt and black pepper.
Heat half of the olive oil in a large skillet over medium-high heat.
Sear the chicken thighs for 5-7 minutes per side until golden brown and the internal temperature reaches 165°F.
Remove the chicken from the skillet and let it rest on a plate.
In the same skillet, add the remaining olive oil and the minced garlic, sautéing until fragrant and golden.
Add the green beans and a splash of water, then sauté for 4-5 minutes until crisp-tender.
Drain the sweet potatoes and mash them thoroughly with a pinch of salt.
Serve the seared chicken alongside the sweet potato mash and garlic green beans, finished with a squeeze of lemon.