To start, preheat your oven to 350 degrees F (175 degrees C). Grease a 9x13-inch cake pan with cooking spray or butter.
In a large bowl, beat the oil and sugar together with an electric mixer until well combined. Add the eggs, one at a time, allowing each egg to blend into the oil mixture before adding the next.
In a separate bowl, stir together the flour, baking powder, baking soda, cinnamon, and salt. Add this mixture to the wet ingredients and beat until everything is well combined.
Fold the grated carrots into the batter, mixing just enough to evenly combine. Pour the batter into the prepared pan.