PREHEAT oven to 300° F. Grease or line baking sheets with parchment paper.
BEAT egg whites, salt and cream of tartar in small mixer bowl until soft peaks form. Gradually add sugar; beat until stiff peaks form. Gently fold in morsels 1/2 cup at a time. Drop by level tablespoon onto prepared baking sheets. Sprinkle lightly with sugar, if desired.
BAKE for 20 to 25 minutes or until meringues are dry and crisp. Cool on baking sheets for 2 minutes; remove to wire racks to cool completely. Store in airtight containers.