Step 1

Line a rimmed baking sheet with parchment paper.

Step 2

To prepare ganache: Place 1 cup chocolate in a medium bowl. Heat coconut milk in a small saucepan over medium heat until it begins to bubble around the edges. Pour the coconut milk over the chocolate; let stand until the chocolate is slightly melted, 3 to 4 minutes. Stir until smooth. Add peanut butter powder, 2 tablespoons at a time, stirring until fully incorporated after each addition before adding more. Rap the bowl on the counter to smooth the top. Cover and refrigerate until set, about 1 1/2 hours.

Step 3

Remove the ganache from the refrigerator and let stand for 10 minutes. Shape into 18 balls, using about 1 tablespoon for each. Place on the prepared baking sheet and refrigerate while you make the coating.

Step 4

To prepare coating: Put about 2 inches of water in the bottom of a double boiler and bring to a boil. (See Tip.) Remove from heat. Put 2 cups chocolate in the top of the double boiler and place it over the bottom. Clip an instant-read thermometer to the top pan, touching the chocolate. Use a spatula to stir the chocolate until it's melted. Do not let the temperature exceed 118 degrees F. Remove the top pan and add 1/4 cup chocolate. Stir until melted. Add the remaining 1/4 cup chocolate; stir until melted and the chocolate is 81 degrees F.

Step 5

To coat truffles: Get the ganache balls out of the refrigerator. Set the top pan back over the bottom and let the chocolate warm up to 88 degrees F, stirring constantly. Remove the top pan. Using 2 forks, dip each ganache ball in the chocolate, letting excess fall back into the pan, and place the truffle back on the parchment. The chocolate should maintain a temperature of 88 degrees F as you work. If it cools, warm it up over the bottom pan, making sure not to let it exceed 90 degrees F or cool below 84 degrees F.

Step 6

Let the chocolate coating set before serving, about 5 minutes. Sprinkle the truffles with salt, if desired.