Wash the kale, and strip the greens from the center rib. Discard the rib, and dry the greens on a kitchen towel. Cut or tear the kale into bite-sized pieces, and place in a bowl. Add in 1 teaspoon olive oil and 1 teaspoon apple cider vinegar, and with your hands, massage for 1 minute. Then, set aside.
In a small bowl, whisk together the remaining olive oil, apple cider vinegar, sea salt, pepper, mustard, and honey. Then, set aside.
Add the diced apples, diced green onions, diced cheddar cheese, and sunflower seeds to the bowl of kale. Then, pour on the dressing, and toss gently.