A great idea for snacks on the summer road trip or back to school lunches. Check out this twist from Tracy! You can check out the full walkthrough at her blog "Just A Trace"
Preheat oven to 350. Grease or line a muffin tin.
Combine flour, baking powder, baking soda, and salt in a large bowl. Whisk together. Combine the oil, milk, mashed banana, coffee, vanilla, maple syrup, sugar, and egg. Whisk the wet ingredients together and pour over the dry ingredients. Stir the ingredients together until almost mixed. Add diced banana and chocolate chips and finish mixing until just combined, being careful not to over mix.
Scoop the batter into the prepared pans, filling the muffin cup about two-thirds full. Bake until the muffin edges are golden brown, for around 16-20 minutes.