01 - In a large bowl, beat together peanut butter, softened butter, vanilla extract, and salt until smooth and creamy.
02 - Gradually add sifted powdered sugar, mixing until the dough is stiff but pliable and holds its shape.
03 - Scoop tablespoon-sized portions and roll each into a ball; place on a parchment-lined baking sheet.
04 - Refrigerate the balls for at least 30 minutes until firm.
05 - Melt chocolate chips and optional coconut oil in a microwave-safe bowl in 30-second intervals, stirring until smooth.
06 - Using a toothpick, dip each chilled peanut butter ball two-thirds into melted chocolate, leaving the top edge exposed.
07 - Place dipped buckeyes back on baking sheet, remove toothpick, smooth any holes, and refrigerate until chocolate is firm, about 20 minutes.
08 - Store buckeyes in an airtight container in the refrigerator for up to two weeks.