world's best chocolate cake

Ingredients For world's best chocolate cake

• 1 stick

  unsalted butter
• 4 oz

  unsweetened chocolate broken up
• 2 1/2 c

  flour
• 2 1/4 c

  sugar
• 1 c

  unsweetened cocoa powder
• 2 tsp

  baking soda
• 1/2 tsp

  baking powder
• 1 1/2 tsp

  salt
• 1 1/2 c

  sour cream
• 3

  eggs
• 2 tsp

  vanilla
• frosting
• 4 oz

  unsweetened chocolate broken up
• 1/2 c

  shortening
• 1 stick

  butter
• 1/4 c

  sour cream
• 1/3 c

  milk
• 2 tsp

  vanilla
• 1/4 tsp

  salt
• 1 box

  1 lb. powdered sugar
• 1/2 c

  unsweetened cocoa powder