- 2 tablespoons butter, softened
- 3/4 cup peanut butter
- 1/2 cup milk
- 1 teaspoon vanilla extract
- 1 (16 ounce) package confectioners' sugar
- Beat butter and peanut butter together in a bowl using an electric mixer until smooth and creamy; stir in milk and vanilla extract. Slowly beat confectioners' sugar into mixture until icing is fully mixed and thick. Store icing in the refrigerator.