In a medium bowl, whisk together the all-purpose flour, cocoa powder, and baking soda until well combined.

In a large mixing bowl, beat the softened butter, granulated sugar, and light brown sugar until light and creamy.

Add the egg, vanilla essence, and red food coloring. Mix until smooth and evenly combined.

Gradually add the dry ingredients to the wet ingredients and mix just until a soft cookie dough forms.

Fold the crushed Oreo cookies into the dough using a spatula until evenly distributed.

Scoop about 2 tablespoons of dough for each cookie and place the dough balls onto a parchment-lined baking sheet, leaving about 2 inches of space between each cookie.

Gently flatten each dough ball slightly with your hand or the back of a spoon.

Bake in a preheated 350°F (175°C) oven for 10–12 minutes, or until the edges are set and the centers remain soft.

Remove the cookies from the oven and let them cool on the baking sheet for 5 minutes.

Transfer the cookies to a wire rack and allow them to cool completely before serving.