Start by rinsing the quinoa under cold water. Add it to a saucepan with 2 cups of water and a pinch of salt. Bring it to a boil, then cover and reduce the heat to low. Let it simmer for 15 minutes or until the water is absorbed, then fluff with a fork.
While the quinoa cooks, preheat your oven to 400°F. Toss the diced sweet potatoes with olive oil, cinnamon, salt, and pepper. Spread them out on a baking sheet and roast for about 25 minutes, flipping halfway through, until golden and tender.
In a small bowl, whisk together the olive oil, maple syrup, apple cider vinegar, Dijon mustard, cinnamon, and salt. Taste and adjust the sweetness or acidity as needed. You can also shake it up in a jar for quick mixing.
If using kale, give it a quick massage with a little olive oil and a pinch of salt. Rub it gently between your fingers for 1–2 minutes until it softens and turns bright green. This removes bitterness and makes it more tender.
Divide the cooked quinoa among four bowls. Top each with a handful of greens, roasted sweet potato, diced apple, dried cranberries, nuts, and a sprinkle of feta if using. Drizzle with maple cinnamon vinaigrette.
Serve the bowls immediately while warm, or store in the fridge for up to 4 days. The flavors meld even more after sitting for a bit, so it’s perfect for leftovers too.