01 - In a large mixing bowl, beat together the peanut butter, softened butter, vanilla extract, and salt using a hand mixer or stand mixer until smooth and creamy.
02 - Gradually add the powdered sugar, mixing continuously until a thick, pliable dough forms that holds its shape when rolled.
03 - Scoop out heaping teaspoonfuls of the peanut butter mixture and roll into 1-inch balls. Arrange them on a parchment-lined baking sheet.
04 - Place the baking sheet in the refrigerator and chill the peanut butter balls for at least 30 minutes, or until they are firm enough to handle without losing their shape.
05 - In a microwave-safe bowl, melt the chocolate chips with coconut oil in 30-second increments, stirring between each interval until completely smooth and glossy.
06 - Using a toothpick inserted into the top of each ball, dip the peanut butter ball into the melted chocolate, leaving the top portion uncovered to resemble a buckeye nut.
07 - Return the coated balls to the parchment-lined baking sheet and remove the toothpick, gently smoothing over any hole with your finger.
08 - Refrigerate the cookies until the chocolate coating is fully set, about 20 minutes.
09 - Serve chilled or at room temperature. Store leftover cookies in an airtight container in the refrigerator for up to 2 weeks.