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

In a large mixing bowl, whisk together the granulated sugar, light brown sugar, and vegetable oil or melted butter until smooth. Incorporate eggs one at a time.

Sift together the all-purpose flour, baking powder, and salt in a separate bowl. Gently stir to mix.

Gradually add the dry mixture to the wet mixture, stirring gently and adding vanilla extract.

Fold in the chopped pecans until evenly distributed throughout the batter.

Pour the batter into the prepared baking dish and spread evenly across the bottom.

Bake for 30-35 minutes until golden brown and a toothpick comes out with moist crumbs.

Cool in the dish for 10-15 minutes, slice into squares, and serve warm or at room temperature.