These are fudgy and gooey in the middle and always a big hit.  You can never have enough.  They are best served with vanilla ice cream.

1   cup oil
4   eggs
2   cups sugar
½  cup potato starch
1   teaspoon vanilla
1   cup cocoa
1   bag (2 cups) chocolate chips

Preheat oven to 350 degrees.  Combine all ingredients and pour into a 9-inch round or square baking pan.  Bake for about 30 to 45 minutes – until top is cracked.