Combine the flour and butter with two knives or your fingertips until it resembles coarse crumbs.
Stir in the sugar. Set aside.
Make the Blueberry Crumble Muffin Batter
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 the crumble topping.
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.
Add cinnamon and/or your choice of nuts or brown sugar to the crumble topping to customize it to your liking.
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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