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PRE-HEAT the oven to 175 degrees Celsius or 350 degrees Fahrenheit. COMBINE 200 gram self-raising flour, white caster sugar and salt in the large bowl.
COMBINE buttermilk, sunflower oil and the egg in the small bowl and mix well with a whisk. When the mixture is smooth, combine the wet and dry ingredients until you've reached a smooth batter.
Carefully mix in the blueberries. PLACE the paper muffin cups inside of the muffin tin. FILL the paper cups with the batter, all the way to the top!
For the crunchy sugar topping, easily combine the 2 tablespoons of flour, light brown sugar and butter. The easiest way to combine is using your hands, therefore it's recommended the butter is at room temperature.
DIVIDE the sugar mixture over the muffins. Now, bake them in the oven for about 20 minutes, depending on your oven. You can check if they're ready with a wooden skewer, if it comes out clean, the muffins are ready! Enjoy!