Preheat your oven to 350 degrees.
Cream together your butter and sugars in a large bowl until light in color.
Add in your vanilla and eggs and mix in.
Dump in your baking soda, salt, cocoa powder and flour and stir until everything is mixed.
Stir in your chocolate chips.
Put your batter in the fridge for about 10 minutes if you don't like how sticky it is. (I don't usually do this.)
Scoop cookie dough by 2-3 tablespoonfuls onto a prepared baking sheet, sprayed with non stick spray, or lined with parchment or a silicone mat. (You want 18-20 cookies total)
Roll cookie dough into large balls.
Bake cookies for 9-10 minutes until the tops look set.
Bang cookie sheet on the counter top a couple times to get cookies to flatten.
Allow cookies to cool on the sheet for 3 minutes then remove to a cooling rack to cool completely.