Easy Chocolate Cake

Ingredients

1 + 1/2 cup (170 g) all-purpose flour
3 tablespoons unsweetened cocoa powder (dutched/dark)
2 teaspoons baking powder
2 pinches salt
1 cup (220 g) sugar
2 teaspoons vanilla essence
3/4 cup (1.8 dl) milk
3/4 cup (1.8 dl) vegetable oil (flavorless)
2 eggs

Ingredients for frosting

1 stick (1/2 cup) + 3 tablespoons (160 g) softened butter
3 cups (7.2 dl) powdered sugar or confectioner's sugar
1/2 cup unsweetened cocoa powder
1 1/2 teaspoon vanilla extract
4 to 5 tablespoons lukewarm milk