Place one apple slice at the bottom of four silicone soap molds.
Add soap cubes to a microwaveable bowl. Microwave on high for 30 seconds. Then microwave at 10 second intervals, stirring in between, until soap is melted.
Quickly stir in clove essential oil and apple pie spice. Pour into a silicone soap mold. Top with a cinnamon stick. Let sit at room temperature for at least 40 minutes.
To remove, turn over soap mold and carefully push on the bottom to pop out the soaps.