Cut your soap base into 1-inch cubes and place in a microwave safe bowl.
Microwave in 30-second intervals until completely melted. Stir well to break up any lingering soap chunks, then add the remaining ingredients. Stir again.
If making two-colored soap like I did, simply separate the soap mixture into bowls and add more clay to one bowl than the other.
Pour the soap into the soap mold and top with extra whole or ground oats.
To make two-colored soap, pour one color and let it cool slightly before pouring the other color over top of it (you may need to re-melt the second color if it’s cooled too much to pour). Feel free to sprinkle oats in between the layers and on top of the soap.
Let cool for several hours before slicing into bars.
Store soap in a dry cabinet or pantry indefinitely.
The most important part of this soap is the oats, so feel free to add as much or as little as you like to meet your skin's needs.