Start by gathering all your ingredients and tools. Ensure your pecans are finely chopped and toasted for the best flavor.
In a large mixing bowl, combine the melted salted butter, finely chopped toasted pecans, and creme de menthe. Stir until well combined.
Gradually add the powdered sugar to the butter mixture. Mix thoroughly until a dough-like consistency forms. You may need to use your hands to knead the mixture gently.
Cover the bowl with plastic wrap and refrigerate the truffle mixture for about 30 minutes. This will make it easier to handle when shaping the truffles.
Once the mixture has chilled, use a cookie scoop or melon baller to portion out small balls. Roll them between your palms to create smooth spheres, then place them on a parchment-lined cookie sheet.
In a double boiler or microwave-safe bowl, melt the semi-sweet chocolate chips and shortening together until smooth. Stir until fully melted and well combined.
Using a fork, dip each truffle into the melted chocolate, ensuring they are fully coated. Tap off any excess chocolate before placing them back on the cookie sheet.
Allow the truffles to cool at room temperature or refrigerate them for quicker setting. Once the chocolate has hardened, your Creme de Menthe Truffles are ready to be enjoyed!