To a mixing bowl, add banana and mash. Then add oil, maple syrup, baking powder, and salt and whisk to combine. Then add non-dairy milk (start with the lesser amount and work your way up as needed) and whisk to combine. If using coconut oil and it hardens or clumps, it's not a big deal. You can microwave (for 45 seconds - 1 minute) to remelt - otherwise, proceed.