1. Heat oven to 350°F. Generously grease cookie sheet or line with parchment paper.
2. Place chocolate in large microwave-safe bowl. Microwave at MEDIUM (50%) 1 minute; stir. If necessary, microwave an additional 15 seconds at a time, stirring after each heating, until chocolate is melted. Stir in sweetened condensed milk. Add coconut and vanilla; stir until well blended. Drop by teaspoonfuls onto prepared cookie sheet.
3. Bake 12 to 14 minutes or until set. Do not overbake. Immediately remove from cookie sheet to wire rack. (Macaroons will stick if allowed to cool on cookie sheet.) Cool completely. About 2-1/2 dozen cookies.