Adapted from a combination of recipes
6-7 egg whites at room temperature
1/2 teaspoon cream of tartar
1/2 teaspoon salt
2 cups sugar
1 tablespoon vanilla
1/2 cup unsweetened cocoa
1 1/2 cups chocolate chips
Preheat oven to 300º.
Beat egg whites, cream of tartar and salt in mixer on high till soft peaks form. Then add sugar, one tablespoon at a time, while mixer continues to beat till firm peaks form. Add vanilla, then sift cocoa into bowl and mix on low till combined. Fold in chocolate chips.
Line baking sheets with parchment. Scoop out rounded tablespoons of batter onto prepared sheets. Bake 40 minutes if you like the centers to be chewy, longer if you prefer a crisp meringue. Cool. Store in airtight container.