Look for the store-brand cocoa in the baking aisle. Because they don't do extensive national marketing, the store- brand merchandise will frequently be less expensive.
1 cup melted margarine
2/3 cup unsweetened cocoa powder
1 cup sugar
1 1/2 tsp vanilla extract
6 Tbsp flour
1 1/2 cup chopped walnuts, divided
Preheat oven to 325°F. Combine margarine, cocoa and sugar in a bowl; blend well. Add eggs 1 at a time, mixing well after each addition.
Add vanilla and flour; mix until smooth. Add 1 cup walnuts and mix well.
Pour into a greased 9-inch pie plate. Sprinkle remaining walnuts over the top.
Bake for 30 minutes or until brownie pulls from the sides of pie plate. Cool for 5 minutes before cutting into wedges.
Storing opened jars or cans of nuts in the refrigerator or freezer will keep them fresh longer. Chop nuts in the food processor by pulsing on and off. Be careful not to over-process and create nut butter.