Start by washing the kale thoroughly under running water. Remove the tough stems and finely chop the leaves. Place the chopped kale in a large mixing bowl.
Add 1 tablespoon of olive oil, 1 tablespoon of fresh lime juice, salt, and pepper to the kale. Using your hands, massage the kale for about 2-3 minutes until it becomes tender and slightly wilted.
To the massaged kale, add the sliced apple, fresh blueberries, avocado slices, crumbled feta cheese, and sunflower seeds. Gently toss the ingredients together to combine.
In a small bowl, combine 1 cup of fresh blueberries, 3 tablespoons of olive oil, 2 tablespoons of freshly squeezed lemon juice, 1 teaspoon of honey, 1 teaspoon of balsamic vinegar, and 2 tablespoons of water. Season with salt and pepper to taste. Use a whisk to blend everything until smooth and creamy.
Pour the blueberry vinaigrette over the salad and toss gently to coat all the ingredients evenly. Taste and adjust seasoning if necessary.
Transfer the salad to a serving platter or individual bowls. Enjoy your Kale Salad with Blueberry Vinaigrette immediately for the best flavor and texture!