Who doesn't love a huge peanut butter cookie? They're the number-one flavor in our house. If someone asks you for a cookie for their birthday, this is a great way to make them a cake-that's also a cookie! Covered with chocolate frosting and filled with colorful candies, this would be the perfect celebration cake.
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Preheat the oven to 350 degrees F. When the dough is cold, bake for 20 to 25 minutes, until the top is golden brown. Let cool completely before frosting.
For the frosting: Using an electric hand mixer or a stand mixer fitted with the paddle attachment, beat the butter until smooth. Slowly mix in the powdered sugar and cocoa powder. Mix in the salt, vanilla, and 2 teaspoons of the milk. Add the remaining 2 or 3 teaspoons milk as needed to reach the desired consistency.