Preheat oven to 350F and line an 8x8 metal pan with parchment paper leaving the edge high. Set aside.
In a medium mixing bowl, make brownie batter as instructed on the package and pour into the metal pan. Bake based on the box instructions, less 5 minutes.
Start cream cheese mixture when there is about 5 minutes left on the brownies, by, beating cream cheese and sugar until smooth (about 3 minutes) in a large bowl.
Add egg and pure vanilla extract to the mixture and beat again for about 1 minute.
When the brownies are complete, leave the oven on and carefully but quickly add the cheesecake layer on top with a spoon.
Add small dollops of jam to the cheesecake layer, then swirl it around with a knife or toothpick (note: be careful to not go too deep and disturb the brownie later).
Place the metal pan back into the oven and bake for another 20 minutes.
Transfer the pan to a wire rack and when cool, chill in the fridge for at least 3 hours.