In a mixing bowl, combine the butter, brown sugar, and white sugar. Cream together on high speed for 2 to 3 minutes until light and fluffy, scraping down the sides of the bowl as necessary.
Add in the eggs one at a time, mixing well in between. Add in the baking soda, salt, and cocoa powder. Keep mixing until everything is well incorporated.
Gradually add in the flour while mixing slowly. Be careful not to overmix; stop when there are no flour pockets left. Your batter should be soft and sticky.
Fold in the miniature chocolate chips with a spatula, ensuring they’re evenly distributed throughout the batter.
Cover the mixing bowl with plastic wrap and chill the dough in the refrigerator for about 30 minutes. Chilling helps the cookies hold their shape while baking.
Preheat your oven to 350 °F (175 °C). Prepare a baking sheet by lining it with a silicon baking mat or lightly greasing it with cooking spray.
While the oven is heating, sift the powdered sugar into a shallow bowl.
Once the dough is chilled, scoop it into tablespoon-sized balls. Roll each ball in the sifted powdered sugar to coat completely. This will give your cookies the signature crinkle look.
Place the dough balls onto the prepared baking sheet, leaving space between each, as they will spread while baking.
Bake in the preheated oven for 8 to 10 minutes, or until the cookies have spread and developed their characteristic crackled tops. Let them cool for about 10 minutes on the baking sheet before transferring them to a wire rack.