Bring a 2-quart saucepot of salted water to a boil over high heat. Remove and discard the stems from the mustard greens and pile the greens together. Slice into 1-inch-wide ribbons.
Add half of the olive oil to a large skillet over medium-high heat. When hot, add the couscous. Cook until browned and toasty, 3 to 4 minutes, shaking the skillet occasionally to get even browning. Transfer to a bowl until the water is boiling. Once boiling, add the couscous and cook until tender, about 13 minutes. Save 1/2 cup of the cooking water and drain the couscous.
Add the remaining olive oil and the garlic to the same skillet. Stir constantly until the garlic begins to brown, about 1 1/2 minutes. Stir in the greens and ham all at once, season with salt and pepper and cook until the greens have wilted and the ham is warm, about 2 minutes.
Add the couscous to the skillet along with the reserved cooking water, a few tablespoons at a time; the mixture should appear loose but not soupy. Serve as a main dish or as a side.
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