1. Heat oven to 350F (175C).
2. Grease rectangular pan, 13 x9 x2 (33cm x 23cm x 5cm).
3. Heat unsweetened chocolate and shortening in a 3 quart (3.0 L) saucepan over low heat until melted.
4. Remove from heat; mix in sugar, vanilla and eggs.
5. Stir in remaining ingredients except candies. Spread in pan.
6. Sprinkle with candies; press lightly.
7. Bake until brownies begin to pull away from sides of pan, about 30 minutes. (Do not overbake!).
8. Cool completely; cut into bars.