Melt dark chocolate with coconut oil and peppermint extract on the stove top in a double boiler, or in the microwave in 30 second increments, stirring in between until smooth.
Line a large cutting board with parchment paper or wax paper. Dip each graham cracker about halfway in melted chocolate and place on lined cutting board.
Drizzle with a little extra chocolate if desired. If the chocolate starts getting too thick as you work just pop it back on the double boiler or in the microwave for another 30 seconds to re-warm.