In large bowl, beat egg whites, cream of tartar and vanilla with electric mixer on high speed until foamy. Beat in sugar, 1 tablespoon at a time; continue beating until stiff, glossy peaks form and sugar is almost dissolved, 5 to 8 minutes, scraping side of bowl occasionally. Do not underbeat. Add remaining ground raspberries and food color; beat at high speed to blend. Fold 1 cup miniature chocolate chips into mixture.