I used boxed brownie mixes for a long time, until I found this recipe for homemade fudge brownies. We like them better than the boxed ones and they are pretty simple to make.
2 sticks melted margarine
2 cups sugar
1/2 teaspoon salt
1/2 cup unsweetened cocoa
1 teaspoon vanilla
1 and 1/4 cup flour
Melt margarine. Combine margarine and sugar in large bowl with whisk. Add eggs and whisk until fluffy. Add salt, cocoa and vanilla. Stir well. Add flour. Stir until mixture is thick and chocolaty. Turn into a well oiled 9 x 13 pan. Bake at 350 degrees for 25-30 minutes.
Remove from oven and cool before cutting.