1. In a small dish, combine dry ingredients and mix evenly.
2. Sprinkle mix with essential oils and mix thoroughly until a slightly damp powder forms.
3. Transfer to wide mouth jar.
4. To use, dissolve 1 to 2 tablespoons into a basin of hot water and soak feet until water is tepid. Rinse and towel dry. Replace spearmint with an additional 5 drops of peppermint.