1 pkg. (12 oz.) Baker's chocolate flavored baking chips
1 c. sweetened condensed milk
1 tsp. vanilla
2/3 c. chopped nuts (optional)

Heat chips and condensed milk in saucepan over low heat, stir until chocolate melts. Remove from heat; blend in vanilla. Spread in buttered 8 inch square pan. Chill until firm, at least 4 hours.