Melt 2 tablespoons of the butter in a large (12-inch) nonstick skillet over medium heat. Add the chickpeas and cook, shaking or stirring, until golden brown, about 5 to 7 minutes. Add the garlic and cook, stirring, until fragrant, about 30 seconds. Add the greens and 1/4 teaspoon of the salt and cook, tossing or stirring, until wilted, 1 to 2 minutes.