Heat oven to 350 and grease a 9x13 baking pan. Set aside.
In a small bowl, combine flour, ginger, cinnamon and cloves. Mix well. Set aside.
In a large, microwave safe bowl, add butter and chocolate and microwave for 2 minutes. Stir completely until chocolate is melted.
Stir in 2 cups sugar and mix well.
Add eggs and vanilla and mix well.
Stir in flour mixture just until combined.
Pour into prepared pan and smooth batter with the back of a spoon.
Bake for 30-35 minutes or until center is set.
Cool completely before cutting into 24 squares.