Add soap 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 orange essential oil, vanilla soap fragrance and orange zest. Pour into a silicone soap mold. 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.