Heat your oven to 400 degrees. This might seem hot, but it's what makes the cake cook perfectly in just 30 minutes.
Get out your 9x13 inch baking pan and grease it well with butter or cooking spray. Then dust it lightly with flour, tapping out any excess. This helps the cake come out clean.
In a large mixing bowl, combine 1 cup self-rising flour, 1 cup white sugar, and 1 cup brown sugar. I like to sift my flour first, but if you don't have a sifter, just make sure to break up any lumps.
Add 2 tablespoons cinnamon and 1 teaspoon cloves to your dry ingredients. Use the back of a spoon to break up any clumps in the brown sugar, then mix everything together well.
In a separate bowl, crack your eggs and beat them well with a fork. I do this over my mixing bowl just in case any shell falls in—it's easier to fish out this way.
Pour the beaten eggs into your dry ingredients. Add 1/2 cup vegetable oil and mix everything together. The batter will be very thick, almost like brownie batter.
Fold in 1 cup chopped pecans, mixing just until they're evenly distributed throughout the batter.
Spoon the thick batter into your prepared pan. Since it's so thick, you'll need to spread it out with the back of a spoon to make sure it reaches all the corners.
Bake for 30 minutes at 400 degrees. Check for doneness by inserting a toothpick in the center—it should come out clean or with just a few moist crumbs.
Let the cake cool in the pan for about 10 minutes before cutting. This helps it set up properly and makes slicing easier.