Pour milk and water into a pot and heat it up on the stove. Add the oatmeal to the pot and stir it around, then add salt, cacao powder, cinnamon, and cardamom. Before adding the dates to your oatmeal, mash them with a fork (you might want to add a few drops of water when mashing the dates).
When your oatmeal is done, you can add the stevia (or regular sugar if you'd prefer that - usually, one cup of sugar would be the same as either 1 teaspoon liquid stevia, 1/3 to 1/2 teaspoon stevia extract powder, or 1 tablespoon concentrated stevia).
After you have followed these instructions, your chocolate oatmeal is done!