Prepare for baking: Preheat the oven to 350°F (175°C) and line two baking sheets with parchment paper to prevent sticking. If you haven’t already, set out your butter and egg to bring them to room temperature for better mixing.
Mix the dry ingredients: In a medium-sized mixing bowl, whisk together the all-purpose flour, baking soda, baking powder, and salt.
Cream the butter and sugar: In a large mixing bowl or stand mixer fitted with the paddle attachment, beat the softened butter and granulated sugar on medium-high speed for 2-3 minutes, until the mixture is light and fluffy. This step is crucial for achieving a soft and chewy cookie texture.
Add the wet ingredients: Mix in the egg, vanilla extract, and peppermint extract, beating until fully incorporated. If using, add the green food coloring and continue mixing until the dough reaches a uniform green shade.
Combine the wet and dry ingredients: Gradually add the dry ingredient mixture to the wet ingredients, mixing on low speed just until combined. Avoid overmixing, as this can make the cookies dense instead of soft and chewy.
Fold in the Mint Oreos: Gently stir in the crushed Mint Oreos, distributing them evenly throughout the dough. For best results, leave some larger chunks to add texture and crunch to the cookies.
Scoop and chill the dough: Use a cookie scoop or ice cream scoop to form dough balls, about 3 tablespoons each, and place them onto a parchment-lined baking sheet. Cover and chill the dough for at least 1 hour (or up to 48 hours). Chilling helps prevent the cookies from spreading too much while baking.
Bake the cookies: Arrange the chilled cookie dough balls on the prepared baking sheets, spacing them 2 inches apart. Bake in the preheated oven for 11-12 minutes, or until the edges are lightly golden and the centers are set but still slightly soft.
Cool before serving: Remove the cookies from the oven and let them cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely. Enjoy!