Preheat oven to 350⁰F (180⁰C). Prepare a 9″ x 5″ loaf pan.
Blend together flour, baking powder and salt.
In a large bowl, mid peanut butter, sugar, vanilla and bananas until well combined. Gradually add milk, beating until well blended.
Add flour mixture to liquid ingredients, beating until mixture is smooth. Fold in peanuts.
Pour into loaf pan and bake about 50-60 minutes, or until cake tester inserted in centre comes out clean.
Let cool in pan 10 minutes. Remove from pan; cool completely on wire rack.