Banana Bread - Nigella Lawson recipe. While the recipe recommends simmering the raisins in rum before adding to the cake mix, I prefer apple juice or whatever juice might be in the fridge - it is sweeter.
Banana Bread: I haven't done a tremendous amount of fiddling with this, but I did once make it, for friends who are more chocolate-crazed than I am, by replacing 25g of the flour with good cocoa powder (not drinking chocolate) and adding 100g of dark chocolate, cut up into smallish chunks. And you could just as easily use the chocolate chips sold in the baking aisle of supermarkets.
Banana Butterscotch Muffins: White chocolate morsels can be used in place of the butterscotch ones and my children seem to love both with equal fervour, though I'm pretty fond of these with dark chocolate chips, too.