Preheat your oven to 400°F (200°C).
Peel and chop the carrot, parsnip, and sweet potato into bite-sized pieces.
Toss the chopped vegetables with olive oil, salt, and pepper. Spread them out evenly on a baking sheet.
Roast the vegetables in the oven for about 20-25 minutes until tender and slightly caramelized, stirring halfway through.
While the vegetables roast, heat a non-stick skillet over medium heat. Add the lean ground beef, seasoning it with salt and pepper, and crumble as it cooks.
Cook the beef until it is browned and fully cooked, approximately 5-7 minutes.
Once cooked, stir in the cooked lentils and nutritional yeast, mixing well to combine the flavors.
Plate the roasted vegetables and top with the beef and lentil crumble.
Serve immediately, enjoying the contrasting textures and savory flavors of this balanced dish.