For the classic: Preheat the oven to 300 degrees F.
Place the kale in a 2-gallon resealable plastic bag. Add the oil and shake and massage the kale to coat each piece entirely. Season with salt and pepper and shake again.
Spread the kale in a single layer on 2 large baking sheets. Bake until the leaves become crispy, 22 to 26 minutes. If any leaves remain flexible (as opposed to a crisp crunch), return them to the oven for 2 minutes more. Allow to cool completely before transferring to a serving bowl or storage container.
For the Italian-style: Follow the directions for the classic kale chips. Immediately after removing the kale from the oven, toss the leaves with the cheese and pine nuts until evenly incorporated throughout.
For the seaside spice: Follow the directions for the classic kale chips. After seasoning the kale with salt and pepper, add the seafood seasoning and cayenne to the bag and massage into the leaves. Immediately after removing the kale from the oven, toss with the lemon zest.