Preheat the oven to 425 degrees. Put the sweet potatoes, onions, cumin, and olive oil in a baking dish and toss to coat everything with oil. Bake for about 45 minutes, stirring occasionally. They should be tender and slightly browned on the edges when done.
While the sweet potatoes bake, cook the wild rice according to package directions.
Place the lentils in a pan and cover with one inch of water. Bring to a boil, then reduce heat to a simmer and cook until tender, about 30 minutes. Drain the water out and season with salt and pepper.
Once the lentils and rice are done, put the spinach, minced garlic, and a drizzle of olive oil in a pan and cook for a few minutes until wilted but still bright green.
Place some wild rice, lentils, sweet potatoes and onion, and spinach in each bowl. Top with sunflower seeds and season with salt and pepper.