Bakery-style
Combine, sugars, and eggs in a bowl and whisk away.
Add the sour cream, vanilla, and mashed bananas to the egg mixture. Add the flour and stir to combine.
Add pecans and fold into the batter. Bake for 6 minutes in 425F oven for 6 minutes. Lower the heat to 350F and continue cooking for 18-20 minutes.