Combine all ingredients for dressing—2 tablespoons rice vinegar, lemon juice, 2 tablespoons avocado oil, 2 tablespoons peanut butter, 1 tablespoon maple syrup, salt, and ¼ teaspoon red pepper powder if using—by whisking in small bowl or shaking together in a small mason jar with lid. Taste with a piece of kale or cabbage and adjust seasoning to taste.
Put the kale in a large bowl. Drizzle with ¼ cup of the dressing and a generous pinch of sea salt. Massage the chopped kale with your hands until the kale is completely coasted and slightly wilted.
Add shredded cabbage, green onions, mint, parsley, shredded chicken if using, half the roasted salted peanuts. Drizzle with the remaining dressing and toss gently to combine.
Divide salad among plates. Garnish each serving with remaining chopped peanuts and shaved parmesan cheese.
Store leftover dressed salad in a tightly covered container in the refrigerator for up to two days. Leftover dressed salad will take on a softer, marinated texture. Store leftover undressed prepped (i.e. washed, dried, and chopped) salad greens in the refrigerator for three days. Leftover Roasted Peanut Vinaigrette will keep for three days in a tightly sealed container in the refrigerator.