For the best texture, use refined coconut oil if you prefer a neutral flavor or unrefined coconut oil if you like a hint of coconut alongside the peppermint and chocolate. If your kitchen is very warm, keep the fat bombs stored in the coldest part of the refrigerator or in the freezer so they stay firm. To make them dairy-free, replace the butter with an equal amount of coconut oil and confirm that your sweetener is dairy-free. For a gourmet touch, lightly sprinkle the tops with a pinch of flaky sea salt before chilling, or swirl in a small amount of unsweetened shredded coconut to the mixture. Always taste and adjust peppermint extract gradually, since a little goes a long way and too much can create an overpowering, toothpaste-like flavor.