Preheat the oven to 350°F and grease a 9x13 inch baking dish with cooking spray.
In a large bowl, whisk together the melted butter, brown sugar, and granulated sugar.
Add eggs one at a time, whisking well after each addition. Add vanilla extract and stir to combine.
Using a rubber spatula, gently fold in the self-rising flour until there are no dry streaks visible. Be careful not to overmix.
Fold in chopped pecans until well distributed throughout the batter.
Pour batter into the prepared baking dish and spread into an even layer.
Bake for 35 to 40 minutes, or until the top is golden brown and a toothpick inserted into the center comes out with moist crumbs.
Let pecanbread cool in the pan before slicing into squares and serving.
*Nutritional information is a calculated guesstimate. Please note that this can change with different brands and modifications you may make to the recipe. For the most accurate information, use a nutritional calculator with the exact brands and measurements you're using with each recipe.