Make: 1. Place sweet potato in bowl and toss with 1 tablespoon olive oil and few dashes of salt. Place on parchment-line baking sheet and bake until soft and edges are browned, about 20 minutes. 2. Meanwhile, place kale in large bowl. Massage for 3 minutes until softened. 3. Add remaining oil, vinegar, garlic, and maple syrup to a mason jar. Shake to emulsify. 4. When sweet potatoes are done, remove from oven and let cool. Add to kale along with walnuts and feta cheese [if using.] 5. Toss with dressing just before serving.