Assemble all the ingredients to streamline your baking process.

Preheat your oven to 375°F (190°C) to ensure consistent and even baking.

In a large mixing bowl, cream together 1 cup of granulated sugar, softened butter, vegetable oil, and sifted confectioners' sugar using an electric mixer. Blend until the mixture achieves a smooth, cohesive texture.

Incorporate the eggs into the mixture one at a time, beating thoroughly after each addition. Follow with the vanilla extract, mixing until fully combined.

In a separate medium-sized bowl, combine the all-purpose flour, baking soda, cream of tartar, and salt. Gradually fold this dry mixture into the wet ingredients until a uniform dough forms. Stir in the chopped pecans to evenly distribute them throughout the dough.

Place the remaining ½ cup of granulated sugar in a shallow bowl. Shape the dough into 1-inch balls, flattening them slightly, and roll each in the sugar to coat.

Arrange the cookies on ungreased baking sheets, spacing them 2 inches apart to allow for expansion during baking.

Bake in the preheated oven for 10 to 12 minutes, or until the edges turn golden brown. Transfer the cookies to wire racks to cool completely before serving or storing.