Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Dice the carrots and zucchini into bite-sized pieces, then toss them on the baking sheet with half of the olive oil and a pinch of sea salt and black pepper.
Roast the vegetables for 20-25 minutes until they are tender and slightly caramelized around the edges.
While vegetables roast, rinse the lentils and place them in a small saucepan with the vegetable broth, dried thyme, and minced garlic.
Bring the lentils to a boil, then reduce heat to low, cover, and simmer for 20-25 minutes until the liquid is absorbed and lentils are tender.
Season the chicken breast with the remaining sea salt and black pepper.
Heat the remaining olive oil in a skillet over medium-high heat and sear the chicken for 6-7 minutes per side until cooked through.
Stir the roasted vegetables into the braised lentils and serve the sliced chicken breast on top.