Step 1

Preheat the oven to 400 degrees F. Line a 12-cup muffin tin with paper liners. In a large bowl, whisk together the flour, sugar, baking powder, baking soda and salt. If using, add the ground cinnamon, ginger or pie spice.

Step 2

In a separate bowl, whisk the eggs until combined. Whisk in the cooled melted butter or oil, milk and vanilla extract. Stir in the bananas.

Step 3

Add the wet ingredients to the bowl with the dry ingredients and stir just to combine. Stir in the blueberries until just combined.

Step 4

Fill each paper liner in the prepared muffin tin at least three-quarters of the way with batter. If desired, sprinkle the tops with sugar in the raw.

Step 5

Bake the muffins until they rise and a toothpick inserted into the center comes out clean, 18 to 25 minutes. Let cool a few minutes in the pan, then remove the muffins to a rack to cool completely.