Prepare the Baking Sheet: Line a large baking sheet with parchment paper and set aside.
Boil the Mixture: In a large saucepan over medium heat, combine butter, sugar, and evaporated milk. Bring to a boil, stirring occasionally. Boil for six minutes.
Add Marshmallows: Remove from heat. Add marshmallows and stir until fully dissolved.
Combine with Dry Ingredients: Mix in graham cracker crumbs and chopped nuts.
Cool the Mixture: Let the mixture cool in the saucepan for 15-20 minutes until manageable.
Shape the Candies: Scoop out the mixture with a one-tablespoon scoop onto the prepared baking sheet. Repeat with the remaining mixture.
Chill: Chill the candies in the refrigerator for at least 30 minutes until firm.
Roll in Confectioners' Sugar: Once chilled, roll each candy into a ball and then coat with confectioners' sugar.