Preheat oven to 350°F (180°C).
Whisk together dry ingredients in a large mixing bowl.
1 ½ cups white all-purpose flour, 1 tsp baking powder, 1 tsp baking soda, ½ tsp salt, ½ tsp nutmeg, ⅔ cup soft brown sugar
In a separate bowl, lightly beat the eggs using an electric hand mixer or a stand mixer.
2 eggs
Add all the other wet ingredients and whisk until well combined.
1 cup mashed banana , ⅓ cup oil, 1 tsp vanilla extract, 1 tbsp milk of choice
Pour the wet ingredients into the dry ingredients and stir with a spatula until combined just combined (don't overmix).
Grease or line a muffin tin with paper liners. Spoon the batter into the muffin tin, filling each cup about ¾ full.
Bake in the preheated oven for about 20-22 minutes, or until a toothpick inserted into the center of a muffin comes out clean.
Allow muffins to cool in the pan for 5 minutes, then transfer to a wire rack to cool completely.