Hi all..I'm looking for a tried and true scratch marble cake recipe,. Thanks in advance.

Do you have a great scratch yellow cake? Take 1/3 of the batter, add cocoa powder to taste, swirl in.

If you use the same recipe as above, it will bake equally.

I usually don't care for marble cake but I really loved this recipe
http://www.myrecipes.com/recipe/chocolate-marble-sheet-cake-10000001842433/