In the bowl of a mixer, cream together the butter and sugar until light and creamy.
Beat in the vanilla and eggs, one at a time, scraping down the bowl after each addition.
Slowly add the flour and baking powder, scraping down the bowl occasionally until all the flour has been incorporated.
Add the chocolate chips and mix well.
Pre-heat the oven to 180ºc and line 3 baking trays with parchment paper.
Using a small ice cream scoop (or a tablespoon), place small (just smaller then a golf ball) scoops of the cookie dough onto the prepared baking sheets, spacing them slightly to allow for spreading.
Place the cookie dough in the fridge until the oven is pre-heated.
Place the baking sheets into the oven and allow to bake for 7-10 minutes until golden brown but still soft in the middle.
Remove from the oven and allow to chill for 10 minutes before transferring to a cooling rack to cool completely.
When the cookies are cool, they can be stored in an airtight container for up to 7 days (if they last that long) or sandwiched with ice cream.
Serve immediately OR wrap in baking/wax paper and place in the freezer until ready to serve.