Here is a recipe I like to use:

Ultimate chocolate brownies

Ingrediants:

1/3 cup(40g/11/3oz)plain flour.
1/2 cup(60g/2oz) dark cocoa powder
2 cups (500g/1Ib) sugar
250g(8oz) dark chocolate
250g(8oz) butter
2 teaspoons of vanila essence
4 eggs,lightly beaten

Method:

1.Preheat the oven to moderate 180c.brush a 20 x 40 rectangular cake tin with melted butter or oil. Line the base and sides with baking paper.
2.Sift the flour and cocoa add sugar and mix well.
3.Use a large sharp knife to chop the chocolate into small pieces
4.Melt the butter in the microwave or oven or in a small pan over low heat.
5.Pour the butter,vanilla amd beaten eggs onto the dry ingrediants.Stir until all ingrediants are moistened and comgined.
6.Pour the mixture into the tin smooth the surface.bake for 45 minutes.cool it in the tin before cutting it into squares.