Looking for a good chocolate recipe for a tall birthday cake?

So I’m baking a cake for my cousin’s birthday, and I need a good recipe for a chocolate cake (she’s turning 10, so no coffee or any other “adult tastes”, please).
I don’t want it to be too sweet and since I’m planning on making 2 or 3 levels, it has to rise and become quite tall (somewhere between 2 and 2.5 inches is good).

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