In medium-sized saucepan, stir together chocolate chips and cooking oil and cook over medium-high heat. NOTE: Stir constantly with wire whisk and cook only until chocolate is melted. If chocolate becomes too thick, add a little more oil.
Once chocolate is melted, turn off the heat and stir in the marshmallows and crackers. Stir until all ingredients are incorporated.
Pour onto a parchment lined cookie sheet and refrigerate until cooled and hardened, about 30 minutes.
Cut it into small rectangles for serving or freeze for later.