In a mixing bowl, blend peanut butter and softened butter with an electric mixer until creamy and uniform.
Add vanilla extract and mix thoroughly.
Gradually incorporate powdered sugar in increments, mixing at low speed and scraping bowl sides as needed.
Gently fold in graham cracker crumbs and crushed Butterfinger bars.
Line a large cookie sheet with parchment paper. Scoop 1 to 1½ tablespoons of dough and roll into balls, placing them on the sheet.
Freeze the balls on the cookie sheet for 30 minutes until firm.
Melt the chocolate in a microwave-safe bowl using 30-second intervals at 50% power, stirring between intervals until smooth but not overheated.
Dip each chilled ball into melted chocolate, coating fully or partially as desired.
Sprinkle optional garnishes such as crushed Butterfinger, sprinkles, or sea salt on coated balls.
Allow chocolate to set completely before serving.