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Preheat your oven to 325°F (165°C). Grease a loaf pan.
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Combine flour, baking powder, salt, and sugar in a large bowl.
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In a separate bowl, whisk together milk and peanut butter until smooth.
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Add the wet ingredients to the dry ingredients and stir until just combined.
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Pour the batter into the prepared loaf pan and bake for about 1 hour, or until a toothpick inserted in the center comes out clean.
