4 ounces semisweet or bittersweet chocolate, chopped
1/2 cup milk
1 1/2 cups all purpose flour
2 teaspoons baking powder
1/4 teaspoon salt
1/4 cup sour cream or plain yogurt
1/2 cup unsalted butter, room temperature
3/4 cup plus 2 tablespoons granulated white sugar
2 large eggs
1 teaspoon pure vanilla extract
And let us not forget that there are other flavors of marble cake besides chocolate. There's my seedless-jam-based strawberry marble, for one (and I'm sure that other fruit jellies, jams, and purees would also work), and there's spice marble (usually done as a coffee cake these days, but from what I've read, it predated chocolate marble).
But if you're going to do a jam-based fruit-flavored marble cake, you definitely want to run some experiments before you do one that actually matters; if it screws up the batter chemistry too badly, you could end up with something with the consistency of a block of marble.
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