Preheat the oven to 350°F (175°C). Line a baking sheet with parchment paper.

In a large bowl, stir together the red velvet cake mix, vegetable oil, eggs, and peppermint extract until combined. The dough will be thick and slightly sticky.

Add green food coloring a few drops at a time until you reach your desired shade. Gel coloring is concentrated; start small.

Fold in the white chocolate chips until evenly distributed.

Use a cookie scoop or tablespoon to drop rounded spoonfuls onto the prepared baking sheet, spacing them about 2 inches apart.

Bake for 10–12 minutes, or until the cookie edges are set but the centers are still soft. Rotate the pan halfway through if your oven bakes unevenly.

Let the cookies cool on the baking sheet for 3–4 minutes, then transfer to a wire rack to cool completely.

When cool, dust lightly with powdered sugar to create a 'snow-dusted' Grinch look.