Preheat your oven to 350°F (175°C).

Cream together the softened butter, brown sugar, and granulated sugar in a large bowl until light and fluffy (about 2-3 minutes).

Add the eggs and vanilla extract to the bowl and mix well.

Sift the all-purpose flour, cocoa powder, baking soda, and salt together in another bowl, then gradually mix into the wet mixture until just combined.

Fold in the crushed Oreos, M&M's, and chocolate chips using a spatula.

Scoop the dough onto a parchment-lined baking sheet, spacing them about 2 inches apart.

Bake for 9-10 minutes until the edges are set but centers appear soft.

Cool cookies on the baking sheet for a few minutes, then transfer them to a wire rack to cool completely.

Optional: Drizzle some melted chocolate on top for an extra touch of decadence.