Preheat the oven to 400°F.
Toss the sweet potato with a little olive oil, salt, and pepper, and spread it on a baking sheet. Roast for about 20-25 minutes until tender and slightly caramelized.
While the sweet potato roasts, season the chicken breast with salt, pepper, and dried thyme.
Heat a non-stick skillet over medium heat with olive oil. Sear the chicken breast on both sides until golden and nearly cooked through, about 4-5 minutes per side.
Add the minced garlic (from one garlic clove) to the pan and cook for 30 seconds until fragrant.
Pour in the heavy cream and lower the heat, allowing the sauce to simmer gently and coat the chicken. Continue cooking until the chicken is fully cooked and the sauce thickens slightly.
In a separate pan, quickly wilt the spinach over medium heat (you can use a splash of water or a drizzle of olive oil) until just tender.
Plate the chicken with a generous serving of silky spinach and a side of roasted sweet potatoes. Drizzle the creamy garlic sauce over the chicken and spinach as desired.