For a thinner coating, stir 1 to 2 teaspoons neutral oil into the melted chocolate. Adjust mint strength to taste by adding a few extra drops of extract, if desired. Store in an airtight container layered with parchment: up to 1 week at cool room temp, 2 weeks refrigerated, or 2 months frozen. If freezing, thaw in the refrigerator to minimize condensation.