Use a double boiler, or make one by setting a glass jar or measuring cup in a medium pot with 1-2 inches of water. Bring the water to boiling, then turn down to med/med-high.
Cool the mixture until it reaches a soft consistency and is able to be mixed.
Use an electric mixer of your choice [stand, hand, or stick blender] to whip the mixture into stiff peaks. The amount of mixing time will change depending on how hard the mixture is.
Add the essential oils while whipping. Store in an airtight glass container in the bathroom.