My friend passed on to me Mary Berry's banana bread (there are several versions, this one has two bananas and 2tbsp milk). It's yummy but I wanted to add chocolate bits and even though the batter is quite thick and I add them after I have poured it into the tin and only mix gently they sink to the bottom. Is there some trick to making the chips more evenly distributed? I am breaking up a bar of chocolate rather than using premade chips. I also would like to add nuts, which I guess are lighter and may not sink?