Ingredients:

2 ¼ cup Flour.
½ cup Cocoa.
1 tspn Baking powder.
3 cups Sugar.
1 cup Butter.
1 tblspn Vanilla.
6 Eggs.
1 cup Semisweet chocolate chips.
1 cup White chocolate chips.
1 cup chopped walnuts.

Preparation Instructions:

In a bowl, cream the butter and sugar.

Add eggs and vanilla and mix well, adding a little flour if necessary.

Combine the flour, cocoa and baking powder.

Stir the flour mixture into creamed butter mixture well.

Pour into a greased tin 15x10x1 inch and spread evenly.

Sprinkle the top of the mixture with chips and nuts.

Bake at 350° for 30-35 minutes.

Source: http://www.brownierecipes.net/chocolate-chip-brownies.html