Things You'll Need:
- 3 tbsp. butter
- 1 1/2 cups powdered sugar
- 1/2 cup peanut butter
- 1/2 cup whole milk
- 1 tsp. vanilla
- Food processor or blender
- Chocolate shavings (optional)
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Step 1
Place the butter in the microwave for 10 to 15 seconds to soften, being careful not to melt it. Alternatively, you can leave it sitting out at room temperature for about 30 minutes to soften.
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Step 2
Combine the softened butter with the powdered sugar, peanut butter, milk and vanilla in a food processor or blender container. Process on medium speed for 1 to 2 minutes, or until the icing is smooth and creamy.
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Step 3
Transfer the peanut butter brownie icing to a large mixing bowl, and place in the refrigerator for at least 1 hour. This will allow the mixture to firm up and become easier to spread.
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Step 4
Remove the icing from the refrigerator, and frost your brownies using a butter knife or the back of a spoon to spread. Make sure the brownies are completely cool, or the icing will melt and become runny.
