Ingredients: Dry Ingredients All purpose flour - 1 1/3 cup cocoa powder - 1/4 cup Sugar - 3/4 Baking soda - 1 tsp Baking powder - 1/2 tsp Salt - 1/2 tsp Wet Ingredients Sour cream - 1/2 cup Unsalted butter - 1/4 cup Milk (hot) - 1 cup Vanilla essence – 1 tsp Walnuts - 1/2 cup, chopped Method: Grease 8 inch round pan or any pan of your choice and keep it aside. Pre-heat oven at 350 degree F (180 degree C). Mix all the dry ingredients in a bowl and pass it through sieve at-least 2 times (I usually do it once and my cake comes out fluffy). Take 1-2 tbsp of dry mixture and mix it with walnuts in a separate bowl. This will ensure that walnuts don't sink in the batter and remain uniformly distributed in the batter. In another bowl, mix all the wet ingredients and blend using a hand blender or food processor for 1-2 minutes. Now fold in dry ingredients and blend it again for 1 minute at medium speed. Once the batter is mixed, add the walnuts, mix together and...