One-bowl Chocolate fudge cake with chocolate sour cream frosting

In the last minute, I've decided to try out this chocolate cake for a birthday cake since my first bake (another chocolate cake recipe) failed! This cake turned out moist and stable, great with my go-to chocolate sour cream frosting. The left over also freezes well. PERFECT!
I've declared this is going to be go-to chocolate cake recipe from now on. No more fussing about with other recipes :p

Chocolate Cake

via kitchencorner

2 cups all-purpose flour

2 cups sugar

¾ cup unsweetened cocoa powder

2 teaspoons baking powder

1½ teaspoons baking soda

1 teaspoon salt

1 cup milk

½ cup vegetable oil

2 eggs

2 teaspoons vanilla extract

1 cup boiling water

2 teaspoon granulated coffee

Chocolate sour-cream frosting

adapted from kwanster

100g chocolate, break into pieces
64g unsalted butter, at room temperature
50-64gm confectioners’ sugar, sifted
3 Tbsp unsweetened cocoa powder, sifted
Pinch of salt, sifted
1/2 cup plus 1 tbsp. sour cream , room temperature **12 or 20% fat
added rum for extra flavour

For the cake:-

1) Pre-heat oven at 180°c.

2) Add flour, sugar, cocoa, baking powder, baking soda and salt to a large bowl. Whisk through to combine using a hand whisk to stir through flour mixture until combined well. 

3) Add milk, vegetable oil, eggs, and vanilla to flour mixture and mix together until well combined. Mix the granulated coffee with  boiling water then pour into the cake batter and mix well combine. 

4) Distribute cake batter evenly between the two prepared cake pans or one cake pan where you can cut horizontally after the cake is baked and cooled down. 

5) Bake for 30-35 minutes if using two pans or 1 hour until a toothpick or cake tester inserted in the center comes out clean. 

6)Remove from the oven and allow to cool for about 10 minutes, remove from the pan and cool completely.

For chocolate frosting :-
1) Melt the chocolate in a heat-proof bowl set over a pot of simmering water. Set aside to cool until just barely warm.
2) In the bowl of a stand mixer fitted with the paddle attachment, beat butter on medium-high speed until pale.
3) Gradually mix in the sifted confectioners’ sugar, cocoa powder and salt, beat until light and fluffy.
4) Beat in the melted and cooled chocolate and then the sour cream.
5) Continue beating until the mixture is smooth and well blended.

Frost cake and decorate as you desire.