Place the chocolate melting wafers in a microwave-safe bowl and heat in 20-second bursts, stirring between each, until fully smooth.
Dip the open end of each mini ice cream cone into the melted chocolate and set it aside on parchment paper to harden.
Spread a thin layer of melted chocolate on the top of each chocolate sandwich cookie and press a dipped cone onto the center to form the hat. Let the chocolate set for a few minutes.
Spoon the remaining melted chocolate over the top of each cooled cupcake and gently press a finished hat into the center so the cookie sits flat against the cake.
Melt the orange candy melts in the same way and pipe or drizzle a thin band around the base of each cone where it meets the cookie.
Add a few green sprinkles to the orange band on each hat before the candy sets.