This dish takes only 5 minutes to prepare, so begin preheating the skillet 7-8 minutes before you are ready to sit down and eat.
Heat a medium sized skillet over medium heat. With the flat side of your knife, make a garlic paste with smashed garlic and salt. Melt butter into pan. Add garlic paste to the pan and the spinach in bunches, adding more spinach to the pan as it wilts down. When all of the spinach is wilted, add wine and turn to coat. Let wine cook down a minute or 2. Season spinach with salt and pepper and serve.