Preheat oven to 350º F. Spray the muffin pan with the baking spray.
In medium bowl, combine the flour, baking powder, baking soda, and salt: set aside.
Combine in a large bowl, (or Kitchen Aid bowl) the eggs, bananas, brown sugar, and melted butter. Mix until bananas are in very small pieces
Then add your flour mixture on low speed, stopping to scrape down the edges. Once your batter is smooth and well mixed, scoop into the muffin pan. Don't fill to the top, leave small space at the edge.
Bake 10-15 minutes, depending on your oven. Check on them at 10 minutes, and if golden brown around the edges, they're done.