Heat oven to 380°.
Melt a tablespoon of butter in a small saucepan on medium-high heat. Peel and slice the banana into skinny slices (3/8 of an inch, roughly)
Heat banana slices on one side for 3-minutes without turning over. Gently flip one banana slice to see if it's browning. If it isn't bump up the heat a little bit. Once golden brown, flip and cook for 2-3 more minutes. Mush them a bit with a fork and set aside.
In a large mixing bowl, whisk together flour, almond flour, salt and powdered sugar.
In a medium size mixing bowl whip the egg whites for 2-3 minutes on medium high until soft peaks form. You'll know they're done when you can flip the bowl upside down and the whipped egg whites don't budge!
Fold the egg whites into the flour mixture and mix until fully incorporated.
Add the melted butter, bourbon, vanilla extract, and bananas to the batter and mix.
In a financier pan or a muffin pan, grease and sugar or flour the pan. You should have about 6-8 muffins. Pour 2 tablespoons of batter into each mold if using a financier pan. If using a muffin tin, place roughly 3 tablespoons of batter in each muffin space. You should end up with 10 "financiers".
Top with chopped pecans and bake in oven fo 15-16 minutes until a toothpick or knife inserted in the middle comes out clean.
Remove from oven and let cool for 5-10 minutes. Carefully remove the muffins and cool on cooling rack. These can also be frozen and saved for later!