Preheat oven to 350°F.
Brush or spray a 9 inch square pan with butter or Pam.
In a food processor or mixer, combine sugar, peanut butter, butter, eggs, and vanilla. Stir in baking powder and flour.
Mix or pulse only until combined. The dough should be stiff.
Transfer mixture into buttered pan, spreading evenly to corners; smooth the top.
Bake for approximately 20 minutes, or until a toothpick inserted into the center comes out clean.
Let cool on a wire rack for 5 minutes, then run a butter knife along outer edge. Cut into serving size portions. Let cool completely before wrapping individually in plastic wrap. Store in an airtight container or freezer if storing for more than 3 days.
Submitted by: CM
