Preheat oven to 375°F. Grease and flour a large bundt pan and set aside.
In a large bowl, mix together oil, sugar, yogurt, eggs, and vanilla.
In a separate bowl, sift together the flour, baking powder & soda, and salt. Fold carefully into the wet ingredients until everything begins to come together.
Add the chocolate chips to the mixture, then continue to fold until just combined. It’s OK if the mixture is slightly lumpy- be sure not to overmix the flour!
Then, using a fork, whisk together brown sugar and cinnamon. Pour half of the batter into the bundt pan and smooth using the back of a spoon or a spatula. Sprinkle half of the brown sugar mixture over the batter and swirl into batter using a fork. Pour in the second half of the batter on top and swirl the rest of the brown sugar mixture into it.
Bake for 55-60 minutes, until a knife comes out clean when inserted into the cake. Allow to cool in the bundt pan for 10 minutes, then plate!