Brownies

Brownies
1/2 cup butter 
3/4 cup cocoa powder
1/4 cup vegetable oil
1 cup white sugar
1 cup brown sugar
2 tsp. vanilla
4 eggs
1-1/2 cup flour
1 tsp. baking powder
1/2 tsp. salt
1/2 cup walnuts, chopped
1/2 cup chocolate chips

In a large saucepan, melt together butter, oil, and cocoa powder over low heat. Remove from heat. Stir in sugar and vanilla; blend well. Add eggs, one at a time. Mix in dry ingredients until just blended. Fold in nuts and chocolate chips. Spread batter in a greased and floured 12" Dutch oven. Bake at 350 degrees (17 coals on top; 8 on bottom) for 35-40 minutes.