Preheat oven to 350 degrees and lightly grease an 8x8" baking pan.
In a large bowl, whisk together pancake mix, sugar, cocoa powder, and salt.
In a separate medium bowl, whisk together egg and yolk, vanilla, melted butter and oil until combined.
Pour wet ingredient into bowl with dry ingredients and using a wooden spoon or rubber spatula mix together until just combined, taking care not to over-mix.
Fold in chocolate chips.
Pour batter into prepared pan, smoothing the top with spoon or spatula.
Bake for 15-18 minutes, until a toothpick comes out clean with just a few moist crumbs.
Let pan cool on a wire rack for at least 15 minutes before removing brownies from pan and slicing into squares.