Brew your coffee and allow it to cool to room temperature. For a quicker option, you can brew the coffee and place it in the refrigerator for about 30 minutes.
In a blender, combine the cooled coffee, milk, peanut butter, chocolate syrup, sugar, and ice.
Blend on high until smooth and creamy, ensuring there are no ice chunks remaining. If the mixture is too thick, add a little more milk to reach your desired consistency.
Taste the frappuccino and adjust the sweetness by adding more sugar if needed. Blend again to mix.
Pour the frappuccino into tall glasses and top with whipped cream. Drizzle additional chocolate syrup on top and sprinkle with chocolate shavings or crushed peanuts for garnish.
Serve immediately and enjoy your homemade treat!