Grease the sides of a 25cm spring-form or loose-bottomed cake tin and line the base with baking paper
Beat the butter and sugar together until they are pale and fluffy.
Add the eggs and vanilla and beat well. Beat in the yoghurt, then add the sifted flour, baking powder and baking soda and stir gently until just combined. (The mixture will be a very thick consistency.)
Spread into the prepared tin, sprinkle with the blueberries and then sprinkle the crumble topping over the top.
Bake for about 50-60 minutes until the cake is golden and a wooden skewer inserted into the middle comes out clean. Stand for 15 minutes before turning out of the tin, then allow to cool before cutting. Store in an airtight container.
Place all the dry ingredients in a large mixing bowl and stir well to combine.
Add the melted butter with a wooden spoon until evenly combined.