Preparation Preheat oven to 325°F. Line 2 large rimmed baking sheets with parchment paper. Place 1 cup chocolate chips in microwave-safe bowl; microwave on low setting at 10-second intervals until chocolate is melted, stirring occasionally. Cool just to room temperature. Using electric mixer, beat egg whites and salt in medium bowl until soft peaks form. Gradually add sugar, then vanilla, beating until whites are thick and glossy. Fold in melted chocolate and coconut, then remaining 1/3 cup chocolate chips. Drop batter by heaping teaspoonfuls onto prepared sheets, spacing 1 1/2 inches apart. Bake cookies 10 minutes. Reverse sheets. Bake until tops are dry and cracked and tester inserted into centers comes out with moist crumbs attached, about 10 minutes longer. Cool cookies on sheets on racks. Store airtight at room temperature up to 2 days.
Preparation Preheat oven to 325°F. Line 2 large rimmed baking sheets with parchment paper. Place 1 cup chocolate chips in microwave-safe bowl; microwave on low setting at 10-second intervals until chocolate is melted, stirring occasionally. Cool just to room temperature. Using electric mixer, beat egg whites and salt in medium bowl until soft peaks form. Gradually add sugar, then vanilla, beating until whites are thick and glossy. Fold in melted chocolate and coconut, then remaining 1/3 cup chocolate chips. Drop batter by heaping teaspoonfuls onto prepared sheets, spacing 1 1/2 inches apart. Bake cookies 10 minutes. Reverse sheets. Bake until tops are dry and cracked and tester inserted into centers comes out with moist crumbs attached, about 10 minutes longer. Cool cookies on sheets on racks. Store airtight at room temperature up to 2 days.