Preheat oven to 350 degrees F.
Line a 13x9 baking pan with foil or parchment paper.
Using an electric mixer, beat together the butter and brown sugar until light and creamy. Add vanilla and egg and beat until well incorporated.
Mix in the flour, baking soda and salt until just combined. Mix in the chocolate chips.
Press half of the cookie dough mixture into the bottom of your prepared pan.
In a separate bowl, beat together the cream cheese and sugar until smooth. Add in the egg and vanilla and beat until well combined.
Pour the cheesecake layer over the cookie layer in your pan. Using a spatula if needed, spread to cover your cookie dough.
Using the remaining cookie dough, grab small handfuls and press them flat with your hands, then lay them onto to the cheesecake mixture. This will allow you to cover almost all of the cheesecake mixture without making a big mess of it by trying to spread the dough over the cheesecake (which won't work too well!).
Bake for 28-33 minutes, until the bars have just started to lightly brown and the center appears set. Remove from oven and allow pan to cool on a wire rack. Once cooled, store in fridge. Slice, serve and enjoy!