For the chips: Preheat the oven to 350 degrees F and place a rack in the center of the oven.
Place the kale on a sheet pan in an even layer. Sprinkle the lemon zest and granulated garlic over the kale. Drizzle the oil over the top and sprinkle salt and pepper to taste. Bake until crisp, about 20 minutes.
For the dipping sauce: In a medium bowl, whisk the sour cream, buttermilk, lemon juice, cumin, paprika and some salt and pepper until combined. Serve with the kale chips.