Preheat the oven to 375°F. In a large bowl, mix together the flour, brown sugar, baking powder and salt. In a separate bowl, beat together the peanut butter, oil, eggs, milk and bananas. Stir the wet ingredients into the dry ingredients just until moistened. Spoon the batter into 12 well greased muffin cups. Bake for 20 to 25 minutes, or until a toothpick inserted in the centre of a muffin comes out clean. Makes 12 muffins. Lucy Waverman’s Fast & Fresh Cookbook.