Step 1 of 4
Pre-heat oven: 350F degrees
Step 2 of 4
Melt butter. Stir in sugar and vanilla. Add eggs. Stir well.Add cocoa, flour, baking powder, and salt. Stir until completely mixed. Then, add walnuts if desired.
Step 3 of 4
Grease 9x13 pan. Pour batter into pan and spread evenly.
Step 4 of 4
Insert into oven and cook for 30-35 minutes.