In a bowl Whisk butter and sugar together until the the sugar crystals dissolves in the mixture

Add eggs in the mixture and continue to whisking

Add flour by sieving it in the mixture and whisk by folding in

Divide the mixture into two.. One put chocolate

Pour the mixture in the baking sheet by altenating the mixtures

Bake in an oven of 180 degrees for 30mins

When it browns Insert a skewer to confirm whether its ready..

If ready put it in a rack to cool