Preheat the oven to 350° Fahrenheit. Place the bananas (with the peel on) in an ovenproof dish and baked for 30 minutes.
Once the bananas are baked, allow them to cool enough to handle. Squeeze out the bananas from the peel into a blender. Blend until smooth.
Place the pecans in a mini food processor/chopper and process until they turn into fine crumbs.
Place the pecan crumbs in a frying pan over medium heat. Stir continuously until the pecans start to turn a golden brown. Watch carefully as they burn easily!
Remove the pecan crumbs to a bowl to cool. Don’t leave in the pan as they could continue to toast and potentially burn.
In a large bowl, using the whisk attachment on a hand mixer, beat egg whites with the cream of tartar until stiff peaks form (about 6-7 minutes).
In another bowl, (using the same whisk attachment) beat egg yolks until light (about 4 minutes); Add the vanilla and ¾ cup of the banana puree and whisk until mixed together. (serve the rest of the banana puree to your baby to eat!)
Combine flour, baking powder, and toasted pecan crumbs; stir into yolk mixture
Fold in one-quarter of the egg whites until combined; fold in remaining egg whites
Grease and flour two 6” or four 4” round baking pans.
Divide the batter evenly between the pans.
Tap the pans on the counter to even out the batter.
Bake at 325° Fahrenheit for 30 minutes (6” pans)/ 25 minutes (4”pans) or until a toothpick inserted in the centre comes out with dry crumbs.
Allow to cool in the pan before removing. Using a plastic knife, gently loosen the sides of the cakes by running the knife between the side of the cake pan and the cake. Turn over and gently tap the bottom.