2	egg whites, room temperature
½ teaspoon	cream of tartar
2/3 cup	granulated sugar
1 teaspoon	vanilla extract
1 cup	mini chocolate chips
1 cup	finely chopped walnuts

1. Preheat oven to 225 degrees. Line baking sheet with parchment paper.
2. Whisk egg whites, cream of tartar, and sugar over simmering water until sugar dissolves and mixture is very thin and warm.
3. Remove from heat and whisk on high speed until stiff peaks form, about 5 minutes. Add vanilla extract.
4. Fold in chocolate and nuts. Scoop onto baking sheet.
5. Bake until firm, about 1 hour.
6. Turn off oven and continue drying until cooked, about 1 more hour.
7. Store in an airtight container.