In a large bowl mash the bananas, I like to use a fork.
Add the eggs, cinnamon, yogurt, sugar, baking soda, baking powder, and salt. Mix everything, then sift the flour into the bowl. Gently fold the flour with the wet ingredients. Before the flour is completely mixed in, add the chopped walnuts. Mix until no dry flour remains.
Transfer the batter to a parchment-lined loaf pan. Top it off with more chopped walnuts and sprinkle brown sugar.
Bake on the middle rack in a preheated oven at 350F(180C) for about 50 minutes, or till a toothpick comes out clean. Let it cool for a few minutes in the pan then transfer to a cooling rack or a plate. Slice and enjoy.Note! Baking time may vary from oven to oven. Start checking after 50 minutes. If the toothpick is still wet, bake a little longer.