Preheat the oven to 350 degrees F.
2. Grease a 9 by 13 by 2-inch cake pan. Line it with parchment
paper, then grease and flour the pan.
In the bowl of an electric mixer fitted with the paddle attachment,
cream the butter and sugar on medium speed until light yellow,
about 2 minutes. With the mixer on low speed, add the vanilla,
eggs, and peanut butter and mix until all ingredients are combined.
3. In a small bowl, sift together the flour, baking powder, and salt.
With the mixer on low speed, slowly add the flour mixture to the
peanut butter mixture. Mix just until combined.
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