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Adjust rack to top position and preheat oven to 425 degrees. (TIP: If you have a toaster oven, feel free to skip preheating.) In a small microwave-safe bowl, place 2 TBSP butter (4 TBSP for 4 servings) and a pinch of Italian Seasoning (you’ll use more later); bring to room temperature. Wash and dry produce.
Halve, peel, and finely dice onion. Peel and dice sweet potato into 1⁄2-inch pieces. Remove and discard any large stems from kale.