Marbled Brownies - cooking recipe

Ingredients

1 c. butter, softened
1 tsp. vanilla
2 c. sugar
4 eggs
1/2 tsp. salt
1 3/4 c. flour
1/4 tsp. baking powder, sifted into flour
2 c. coarsely chopped nuts
2 sq. unsweetened chocolate, melted and cooled

Preparation

Cream butter, vanilla and sugar until light and fluffy.
Add eggs, one at a time, beating well after each.
Add flour and salt; mix until well blended.
Stir in nuts.
Divide batter in half; add chocolate to one half and mix.