In a mixing bowl, add eggs and whisk them. After mixing, add in vanilla extract then setaside. Take another bowl and mix softened butter and equal parts of sugar into the bowl.Whisk until the volume of batter increases and the color of batter is pale. Lastly, add eggmixture into the butter mixture.
Sieve in equal parts of cake flour in the batter and then add equal parts of milk until all flour and milk is combined. After the flour and milk is combined in the batter, pour batterinto a deep toast bread baking mold. Lastly, add blueberries on the batter and mix the blue-berries slowly into the batter.
Bake the cake in the oven for40 Minutes in 170C heat.
Remove the baking mold and cut the cake into servings.