Preheat oven to 400 Degrees FahrenheitLine a muffin tin with paper muffin linersIn one bowl mix the brown sugar, flour, salt and baking powder. When mixed, add the blueberries and mix againIn another bowl, mix the egg, mashed banana, milk and oilAdd the liquid ingredients to the flour mixture and mix with a spoon until combined. DO NOT OVERMIXSpoon the batter into each muffin linerBake for 15-20 minutesEnjoy!