Sift flour, baking powder, and baking soda into a large bowl.
Stir in the sugar.
In a separate bowl or measuring jug, whisk together the eggs, olive oil, and yogurt until smooth.
Wash the blueberries and dry. If using frozen berries, toss them in a teaspoonful of flour to help them not to fall whilst baking.
Pour the yogurt mixture into the dry ingredients.
Slowly stir together in the large bowl until just combined. DO NOT OVER STIR as it will make the muffins too dense.
Gently add the blueberries with just a few turns. (Keep a few aside for putting on top of the muffins, if you like.) Fill the muffin cases. Sprinkle with a little sugar if desired. This makes a crunchy top and adds a little sweetness.
Bake for about 20 minutes or until golden brown.
Notes
Use almost any fruit to like in these muffins. All the fruits I've tried have turned out brilliantly: peach, rhubarb, cranberry/orange (using fresh and dried cranberries), and of course, plums.
You can bake the entire mixture in a loaf pan, too! The only thing is that it will take about 45 minutes or possibly longer to bake.
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