Sift flour, baking powder, baking soda and a pinch of salt into a large bowl. Stir in the sugar. (Do not miss this step.)
In a separate bowl or measuring jug, whisk together: eggs, olive oil, and yogurt, until smooth.
Pour the yogurt mixture into the dry ingredients. Slowly fold the yogurt mixture into the dry ingredients in the large bowl, until just combined. DO NOT OVER STIR, it will make the muffins too dense.
Gently stir in the mixed fruit, with just a few turns, then fill the muffins cups or greased and floured loaf tin. Sprinkle with a little Demerara, Swedish pearl sugar, or raw sugar if desired, for a crunchy top.
Bake for about 18 to 20 minutes or until golden brown.
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