Wash hands with soap and water for 20 seconds.
Do not taste or eat any raw dough or batter made with uncooked flour and/or raw eggs.
Preheat the oven to 350°F.
In a large bowl, pour boiling water over oatmeal. Let stand at room temperature for 10 minutes.
Add brown and white sugar and margarine/butter. Stir until margarine/butter melts.
Add eggs. Mix well.
In a medium bowl, sift together flour, soda, salt and cocoa. Add flour to sugar mixture. Mix well.
Add about half of the package of chocolate chips.
Pour batter into greased and floured 9x13-inch pan.
Sprinkle walnuts and remaining chocolate bits on top of cake batter.
Bake in oven for 35-40 minutes or until wooden pick inserted in center comes out clean.
Remove from oven. Cool completely in pan on cooling rack, about 2 hours.