Add the butter to the mixer bowl and beat over low speed for a few seconds.

Add the sugar and mix until butter and sugar are slightly crumbly. Add in the eggs and vanilla, beat over medium speed until completely combined together.

In a medium size bowl mix together the flour, baking soda, and salt. Stir together until combined. Add dry ingredients slowly into the mixing bowl and mix with low speed until fully combined. Add in the cocoa powder and mix over low speed until fully combined, scrape sides of bowl with rubber spatula as needed. Will be a thick dough. Add in 1/4 cup of the dark chocolate chips.

Using a spoon scoop a 1 inch ball of dough and place onto a lined or greased cookie sheet. Top with remaining chocolate chips as desired.

Bake for 10-11 minutes. Remove from oven and allow to cool for about 5 minutes then remove from the cookie sheet and place onto a cooling rack to continue cooling.