Mix together in a medium size bowl:
1/2 cup oil (vegetable)
1/2 cup dark dutch process cocoa (Grandma uses Hershey's Special Extra Dark Cocoa)
1 cup white sugar
Beat in two eggs*
In a separate bowl mix together:
1/2 cup all purpose flour*
1/4 tsp baking powder
Add the flour mixture to the chocolate mixture and beat well by hand (about 50 strokes with a spoon or spatula).
Last, stir in a 12 oz bag of semi-sweet chocolate chips (Grandma uses the Hershey's special dark chocolate chips).
Pour batter into a greased and floured 10 inch square pan and bake at 350 for about 15-25 minutes depending on your gooeyness preference.
*For high altitude, I used jumbo eggs and added 2 T more flour.