Fill a large pot with 1 inch (2.5 cm) water and place a steamer basket inside. Bring the water to a boil over medium heat, then add the baby spinach. Cover with a lid and steam until just wilted and bright green, about 3 minutes. Turn off the heat.
Lay a clean dish towel flat on the counter. Using tongs, spread the spinach on the towel to cool. When the spinach is cool enough to handle,