Step 1Place a rack in the center of the oven; heat the oven to 400 degrees. Spray a baking sheet with cooking spray. Set aside.
Step 2Lay 12 wonton skins on the baking sheet in a single layer. If there is any flour left on them, lightly brush it off.
Step 3Lightly brush each skin with egg white. Sprinkle 1/2 teaspoon of rosemary leaves evenly over the skins, then about 1/8 teaspoon salt.
Step 4Bake the chips until medium brown, about 6 to 7 minutes. Transfer them to a rack to cool. Repeat with the remaining ingredients. (The chips can be made a week ahead and kept at room temperature in an airtight container.)