Preheat oven to 350 F, I used convection oven
Mix dry ingredients in a bowl
Mix sugar and oil in a separate bowl, then pour in vanilla, and milk mixture, whisk to combine
Mash in bananas
Take out 1 heaping cup of batter and mix with cocoa powder. Pour mixture into piping bag
Pipe white batter, then top with chocolate batter. Repeat steps until all used up
Sprinkle with slivered almonds, if using, and drop a couple choc chips here and there, if using
Bake for 35 mins, cool on rack