Peanut Butter Balls (Truffles)

Bahan-bahan (32 porsi)

• 6 Tablespoons (85g) unsalted butter, softened to room temperature
• 1 cup (250g) creamy peanut butter (not natural style)
• 2 and 1/2 cups (300g) confectioners’ sugar
• 1/2 teaspoon pure vanilla extract
• 1/8 teaspoon salt
• 12 ounces (three 4-ounce bars) semi-sweet chocolate bars (339g), coarsely chopped*
• 1 teaspoon vegetable oil (see Note)
• optional: sprinkles for topping