Preheat your oven to 350°F (175°C) and prepare a 9x13-inch baking dish with grease or parchment paper.

In a large mixing bowl, combine granulated sugar, brown sugar, and vegetable oil or melted butter until smooth and creamy, about 2-3 minutes. Add the eggs one at a time, whisking well after each addition.

In a separate bowl, mix together all-purpose flour, baking powder, and salt until well blended.

Gently fold the dry mixture into the wet ingredients until no dry flour remains. The batter should be thick and slightly lumpy.

Stir in the chopped pecans until evenly distributed.

Pour and spread the batter into the prepared baking dish.

Bake for 30-35 minutes, until the top is golden brown and a toothpick inserted in the center comes out with a few moist crumbs.

Cool in the pan for about 10 minutes before transferring to a wire rack.