Preheat the oven to 400 degrees F.
Slice the bottom 1/4-inch from the apples so that it sits evenly and cooks thorough. Using a paring knife, carefully cut a circle around the stem and cut about an inch downward to open up the top. From there, use the same knife or a spoon, to remove the core and the seeds.
In a bowl combine the butter, cinnamon, cardamom, sea salt and black pepper and microwave on high for 45 seconds, or until the butter is just melted. Stir with a spoon to combine thoroughly.
Set the apples in a cast iron skillet or baking dish. Drizzle each one with the melted butter mixture, distributing it evenly.
Stuff each apple with the KIND Healthy Grains Peanut Butter Clusters, distributing it evenly into each apple.
Sprinkle the outer skin of each apple with the olive oil, letting it drip to the bottom and onto the skillet.
Drizzle the apple cider vinegar evenly over each apple as well. Then add 1/4 cup of water to the bottom of your skillet.
Bake for about 45 minutes. This will depend on the exact size of your apples (if using small/medium apples, start by baking for 30 minutes).
Once the skin has wrinkled and the apple is slightly darker in color and fork tender, remove from the oven. If you want a more caramelized apple, cook for a bit longer. Serve immediately with whipped cream on top.