1. Grease a 9×13-inch pan with butter or nonstick spray and set aside.

2. In a large pot, melt the butter over low heat.

3. Add the mini marshmallows and stir until completely melted and smooth.

4. Stir in a few drops of green food coloring until the mixture turns Frankenstein green.

5. Remove from heat and add the Rice Krispies cereal, stirring gently until fully coated.

6. Press the mixture evenly into the prepared pan using a buttered spatula or wax paper.

7. Allow to cool for about 30 minutes, then cut into rectangular bars.

8. Melt the chocolate chips in the microwave in 20-second bursts, stirring in between.

9. Dip the top of each bar into the melted chocolate to create Frankenstein’s “hair.”

10. Attach candy eyes while the chocolate is still warm.

11. Insert pretzel sticks into each side of the bar for Frankenstein’s neck bolts.

12. Let chocolate set before serving.