Mini castella cake : the soft and greedy dessert

Ingredients:
40 gr of butter
70 gr of milk
40 gr of honey
5 egg whites
110 gr of sugar
5 yolks
Vanilla extract
120 gr of flour

Directions:
Melt the butter and mix it with the milk and honey.
Whip the whites with the sugar then add the yolk, vanilla and flour. Mix 4 tablespoons of batter with the butter mixture and combine. Pour batter into mini pans and bake at 320°F (160°) for 7 minutes, 300°F (150°) for 15 minutes.