Preheat your oven to 350°F (175°C). Line two baking sheets with parchment paper.
In a large mixing bowl, combine the red velvet cake mix, vegetable oil, eggs, and vanilla extract. Mix until the ingredients are well incorporated and a soft dough forms.
Gently fold in the white chocolate chips and chopped pecans, if using, until evenly distributed throughout the dough.
Scoop tablespoon-sized portions of the cookie dough and place them onto the prepared baking sheets, spacing them about 2 inches apart.
Bake in the preheated oven for 10-12 minutes, or until the edges are set and the tops look slightly cracked.
Remove the cookies from the oven and let them cool on the baking sheets for about 5 minutes before transferring them to a wire rack to cool completely.
Once the cookies are completely cooled, sift powdered sugar over the top for an extra touch of sweetness and a beautiful presentation.