Preheat your oven to 325°F.
In a mixing bowl, combine the flour, a pinch of salt, sugar, vinegar, and baking powder.
Stir in the milk and peanut butter until you achieve a smooth batter.
Pour the batter into a greased loaf pan.
Bake for approximately 1 hour and 10 minutes, or until the bread is golden brown and a toothpick inserted into the center comes out clean.
Let the bread cool slightly before slicing and serving.
