Make Grinch Cookies Recipe at home, capturing festive holiday flavors with peppermint and vibrant green color.
Preheat your oven to 375°F and prepare a large baking sheet lined with clean parchment paper so it's ready when the dough is shaped. This quiet, anticipatory step is about setting the stage: bring the oven to temperature while you assemble everything you need on the bright work surface. Make sure the rack is centered and the parchment lies flat so cookies bake evenly and release cleanly.
In a roomy mixing bowl, blend the white cake mix with softened butter and the eggs until a cohesive, slightly dense dough forms. Stir in the peppermint and vanilla extracts, then add green gel food coloring a little at a time until the batter is uniformly pastel green and convincingly tacky—thick enough to hold its shape but soft enough to scoop. Use a hand mixer or stand mixer; the beaters will carry streaks of green and a glossy sheen from the butter, showing the dough is fully combined and slightly sticky to the touch. The bowl will have residual green ridges and swirls where the mixer scraped the sides, and the dough should cling to the beaters in ribbon-like folds.

Whisk powdered sugar and cornstarch together in a small bowl until the mixture is feather-light and free of lumps; this dry blend will create the classic crinkle finish and prevent excess stickiness during rolling. The sugar mixture should look snowy and matte, contrasting the glossy wet dough when applied.
Scoop the dough with a 1 1/2-tablespoon cookie scoop and roll each portion into a smooth ball, then drop the balls into the powdered sugar bowl to coat completely. Transfer each sugar-dusted ball onto the parchment-lined baking sheet about an inch apart so they have room to spread; the surface should show a uniform white sugary cloak clinging to tiny creases. Keep the cookie scoop nearby with a smear of green dough on its rim, and a small bowl of the powdered mix to one side—this is a neat, intentional work-in-progress stage where the dough transitions from sticky mass to individual, sugared mounds ready for heat.

Slide the sheet into the preheated oven and bake for 10 to 12 minutes until the edges are set and the tops form faint crinkles; the cookies will puff into pillowy domes with slightly taut, crackled skins. Remove them immediately and press a single red heart-shaped sprinkle into the warm center of each cookie so it nests into the dough, creating a tiny inset of bright color. On the baking sheet the cookies will glisten faintly where butter rose to the surface, with soft edges and a dusting of residual powdered sugar in the crevices, and a few stray sugar specks around the parchment. Allow them to rest briefly so the hearts sit flush without sinking completely.

Let the cookies cool on the baking sheet for about five minutes so they firm slightly, then transfer them to a wire rack to finish cooling; their surface should be matte but with visible sugar dust in the cracks, and each red heart should appear gently embedded at the center. Arrange them thoughtfully for serving or photography while still warm enough to hold shape but cool enough not to melt decorations.
