Line a large baking sheet with parchment paper. Set aside. Place chocolate chips in a microwave-safe bowl. Microwave for 30-second intervals, stirring after each until most of the chips have melted.
In a medium heatproof bowl, microwave chips and oil in 20-second increments, stirring between each, until melted and smooth, about 1 minute total. Dip graham cracker sandwiches into chocolate ...