Preheat oven to 340 F and prepare a 20 x 30 (cm) brownie tray, or use a disposable tray.

For the cookie dough layer, cream together the butter and sugars till light and fluffy. Add the eggs one at a time, mixing between each addition followed by the vanilla extract. Add the flour and mix until just combined, stir in the chocolate chips. Press the dough into your prepared pan in an even layer. Place the Hershey's Kisses down on top of the cookie layer, in 4 nice neat rows of 6 kisses. Set aside while you make the brownie layer.

In a large saucepan over a low heat melt the butter and chocolate together. Remove from the heat and add the sugar and stir together. Crack the eggs into a bowl and whisk. Slowly pour the eggs into the chocolate mixing as you go, until combined. Add the flour and stir until the white streaks just disappear. Pour the brownie mixture over the cookie dough and Hershey's Kisses making sure everything is covered but your don't over fill the tray. Bake for 40 minutes, until just set.

Allow to cool in the fridge over night before cutting into squares and enjoying.