1.Preheat oven to 350F. Grease a loaf pan.
2. In a bowl, sift together flour, baking powder, baking soda and sugar. Stir in nuts, egg replacer, bananas, oil and vanilla, mix well. Pour the mixture into the prepared loaf pan.
3. Bake at 350F for about 60 minutes, until tip of an inserted skewer comes out clean. Allow to cool for 10 minutes, transfer to a cooling rack, allow to cool completely.