Preheat oven to 350 F. Grease a standard-sized loaf pan and set it aside.In a small bowl whisk the flour, baking powder, and salt together.
In a separate large mixing bowl beat butter and sugars on low speed 2 minutes, Beat in peanut butter then egg and vanilla, scraping down sides of bowl.
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Add flour mixture and beat on low until combined, the batter will be very thick and crumbly. Pour in milk and beat on low until batter is smooth.Add batter to loaf pan and evenly spread it out. Bake for 50 minutes or until the center springs back when pressed with a fingertip.
Cool in pan on wire rack 15 minutes, remove from pan and cool completely.
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