Mini Cake. Easy Recipe. Chocolate cake And Vanilla Butter Cream

*** Chocolate cake (pansize: 22 x 36cm)
130g all purpose flour
35g cocoa powder
1 tsp baking soda
1/2 tsp baking powder
1/4 tsp salt
1/2 tosp coffee powder
100g brown/ white sugar
1 egg
80g milk (room temperature)
30g melted butter (or vegetable oil)
90g hot water
1 tosp vanilla
1 tosp vinegar
*** Vanilla butter cream
350g room teperature butter powdered sugar
1 tbsp vanilla
70g heavy cream
food color: pink, green, blue, brown