Perfect Meringue Mushrooms Recipe

Ingredients (6)

• 6 ounces egg whites (2/3 cup; 170g), from 5 to 6 large eggs
• 9 ounces toasted sugar (1 1/4 cups plus 1 tablespoon; 255g) (see note)
• 1/4 teaspoon (1g) Diamond Crystal kosher salt; for table salt, use about half as much by volume or the same weight
• 1/4 teaspoon cream of tartar
• 1/2 ounce (1 tablespoon; about 15g) vanilla extract, or more to taste
• 4 ounces finely chopped dark or milk chocolate (about 2/3 cup; 115g)