Sift the flour, baking powder, baking soda and salt into a large bowl, then stir in the sugar.
Put the chopped nuts into a bowl and set aside.
In another bowl or measuring jug, whisk together the eggs, olive oil, and yogurt until evenly mixed.
Mash the bananas in a small bowl and set aside.
If using the amber rock sugar, crush gently with a mortar and pestle or other method.
Pour the yogurt mixture into the dry ingredients in the large bowl, and stir gently a few times (do not completely mix in).
Next, add the mashed banana and fold in a few times before tossing in the nuts. Continue to mix the batter gently until just combined (over mixing will ruin the texture).
Fill the muffin cups evenly. (OPTIONAL: sprinkle the muffins with a little crushed amber rock sugar, or other sugar, for a crunchy top.)
Bake for about 18-20 minutes or until golden brown and a cake tester comes out clean.
Cool for 5 minutes before placing on a cooling rack or putting into a cloth lined basket to serve.
Notes
Sugars that work well on top of these muffins:
Swedish pearl sugar
Crushed Belgian pearl sugar
Demerara sugar
Sugar in the raw
Golden sugar
An alternative way to bake this batter is in a loaf time, as a banana nut loaf. Baking time will be much longer, at least 35 to 40 minutes. Check the cake with a tester after smelling the banana aroma coming out of the oven.
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