Beat butter until softened. Add sugar and beat until light and fluffy, about 3 minutes. Add eggs, one at a time, beating 30 seconds after each addition.
In another bowl, combine the flour, baking soda, and salt. Add them into the mixing bowl. Add the cocoa powder too. Beat to combine the whole thing together.
Add in the milk, vanilla, and nutella. Beat for the last time. Lightly butter and dust with flour 2 cake-round pans. Pour batter into the pans, in equal parts.
Preheat the oven to 350 degrees.
Bake cake for about 25-30 minutes or until a cake tester(toothpick) comes out clean. Let the cake cool completely before frosting.
FROSTING. Mix butter and nutella together. Add the powdered sugar and continue to beat until combined. Add milk if the frosting is too thick for your taste.
Carefully cut the top part of the first cake. Place the cut portion in the bottom. Frost the “top” of that cake. Cut the top part of the second cake. Place the cut part on top of the first cake. Frost the cake completely.
