Preheat oven to 350 degrees and prepare a loaf pan with parchment paper.
In a large mixing bowl, add vegetable oil, sugar, and sour cream. Add eggs one at a time, mixing after each one. Add vanilla and mix.
In a medium mixing bowl, add cake flour, cocoa powder, baking powder, baking soda, and salt and whisk together.
Add flour mixture and milk to the oil mixture alternating each two times. Mix until flour is incorporated. Add chocolate chips to the batter.
Pour batter into loaf pan. You can top batter with a few more chocolate chips if you like. Bake for 40-50 minutes, test the loaf with a toothpick in the center. Continue baking, adding 3 minutes at a time, until the center is baked and the toothpick comes out clean. Cover the top with tinfoil if it's getting too dark before the loaf is done.
Remove the loaf from the oven and let it cool in the pan. Enjoy!
Optional chocolate ganache glaze. Place 1/2 cup of chocolate chips into a microwave-safe bowl. Cover the chocolate chips with just enough heavy cream to the same level as the chips. Microwave until melted. Started with 20 seconds, stir and add 10 seconds at a time until melted. Pour ganache over the top of a cooled loaf.