Original recipe from Smitten Kitchen http://smittenkitchen.com/blog/2015/02/the-i-want-chocolate-cake-cake/ She's a fan of whipping this up in the food processor, but I've always gotten better results with either a stand mixer or a hand mixer. This amount is perfect for a three layer 6 inch cake. If you want to frost an 8 inch or 9 inch layer cake, I'd double the recipe. The cake recipe is my One Bowl Chocolate Cake recipe - http://bakingparttime.com/one-bowl-chocolate-cake/