Preheat the oven to 400°F (200°C) and line a baking sheet with parchment paper.
Peel the carrot, parsnip, and sweet potato. Cut them into similarly sized bite-sized chunks for even roasting.
Drain and rinse the chickpeas thoroughly. Pat them dry with a paper towel.
Cut the tempeh into cubes about 1-inch in size.
In a large bowl, combine the chopped carrots, parsnip, sweet potato, chickpeas, and tempeh. Drizzle with a small amount of olive oil, and season with salt, pepper, and any desired herbs (such as rosemary or thyme). Toss well to evenly coat all pieces.
Spread the vegetable and tempeh mixture on the prepared baking sheet in a single layer.
Roast in the preheated oven for 25-30 minutes, stirring halfway through, until the roots are tender and lightly caramelized and the tempeh has a crisp edge.
Remove the baking sheet from the oven and immediately sprinkle the nutritional yeast over the hot mixture for an added umami boost.
Allow to cool slightly before serving, and enjoy your hearty, protein-packed Roasted Root Medley.