This is a super easy and super delicious recipe.
However, I had the same problem with another reviewer who reviewed a similiar recipe 'Brownie Bottom Cheesecake'. I baked the brownie for 15 minutes. While I pulled the cream cheese mix, the brownie bottom collapsed. My advice is that it is always wise to be precautious and use the toothpick to test the brownie center before pulling the cream cheese. If the brownie center is too liquid, might need to bake a little longer. Enjoy.