Easy Peanut Butter Microwave Fudge

Prepare a baking dish by covering it with parchment paper or waxed paper to prevent sticking.

Combine peanut butter and butter in a microwave-safe container, ensuring it is suitable for high-heat cooking. Microwave the mixture on high power in short intervals of 30 seconds, stirring frequently until it reaches a smooth and fully combined state. Allow the mixture to relax for 2-3 minutes before proceeding.

Gradually add confectioners' sugar, one-half cup at a time, blending it thoroughly into the mixture. Press the combined mixture into the prepared baking dish and refrigerate it. Refrigeration is necessary for at least 2 hours or overnight to achieve a firmer texture before serving.