While the crust is baking, start on the filling. In the bowl of a stand mixer with paddle attachment, on low speed add cream cheese and mix for 3 minutes until smooth. Slowly pour in maple syrup, increase speed to medium and mix for 5 minutes, pause in between to scrape down the bowl (don't skip this step as it will help ensure a smooth filling).
Reduce speed to low and add one egg at a time (beat for 1 minute after each egg). Once eggs are incorporated, mix in mascarpone cheese and combine thoroughly on medium speed for 5 minutes until the filling has no clumps left. Pause in between and scrape down bowl.
Pour filling into crust while rotating the pan to distribute filling evenly (filling will be close to the top of the pan). Smooth the surface with a spatula and tap pan onto counter a few times to remove air bubbles.
Wrap the pan with 4 aluminum foil sheets to cover evenly around the sides (might seem excessive, however you want to prevent water from seeping into the cake while sitting in the water bath*).
Pour hot tap water 1 inch up in large oven proof skillet or roasting pan that has a 2 or 3 inch height. Carefully place cake pan inside roasting pan and ensure water level does not rise into the cake filling. Add a little more hot water if needed to ensure water level is at the half way mark of the roasting pan. Slowly and carefully place the roasting/cake pan on the middle rack in the oven. *See notes for more info and options on water bath method*
Bake for 1 hour with convection bake temperature or 1 hour 15 minutes with regular bake temperature until surface of the cake is a nice golden brown colour.
Turn oven off, leave oven door cracked open to allow hot air to escape (wedge a wooden spoon in the oven door if needed). Let cake cool down in the oven for 1 hour.
Carefully move roasting pan onto stove top and lift cake pan out of water bath. Remove aluminum foil. Use a butter knife and carefully loosen sides of the cake by running the knife around the cake. Place cake pan on top of a food can. Gently unlatch the spring form and slide the form down. Place the cake back on the counter and wrap the cake in plastic wrap. Chill in the refrigerator for 4 hours (overnight is even better).