Preheat the oven to 425℉. Get out two baking sheets and line them with parchment paper or reusable silicone baking mats. While the oven is preheating, prepare the sweet potato and chickpeas.
Clean and cube the sweet potatoes into ½ inch cubes. Add the sweet potato to a large bowl with 1 tbsp olive oil, ¼ tsp salt and pepper, and ½ tbsp chili powder and cumin, and ½ tsp paprika and garlic powder. Mix to combine and pour over a baking sheet, making sure the potatoes are in a single layer to ensure the potatoes roast evenly.
Next, drain, rinse, and pat dry the chickpeas. Then add them to a mixing bowl, along with 1 tbsp olive oil, ¼ tsp salt and pepper, and ½ tbsp chili powder and cumin, and ½ tsp of paprika and garlic powder. Mix to combine and pour over a baking sheet, into a single layer.
Roast the sweet potatoes and chickpeas for 25 to 30 minutes. Take out to turn the chickpeas and sweet potatoes after about 15 minutes. They should be a nice golden brown color. Let the roasted sweet potatoes and chickpeas cool for at least 5 minutes before tossing with the kale. This will prevent the kale from wilting.
While the sweet potatoes and chickpeas are baking, clean your kale. Then cut up into bite-sized pieces and add to a mixing bowl and then massage the kale, to make it tender, for about 1 to 3 minutes.
For the dressing, combine all ingredients, the yogurt, mustard, agave or maple syrup, garlic, lemon juice, salt, pepper, dill, and chives into a mixing bowl and whisk until combined. Taste and adjust seasoning for your preference.
Once the sweet potatoes and chickpeas are done, combine with the kale, add the avocado, feta, and dressing, and mix to combine. Serve as a main dish or a creamy side salad. Note, if you want to keep this as leftovers, do not combine everything; it will store better separate, rather only mix together what you plan on eating.
Store the leftover kale, sweet potatoes, and dressing in separate airtight containers in the fridge for 3 to 4 days. Store roasted chickpeas in a loosely covered container at room temperature. They are best used within two days.