Reduce the oven temperature to 300°F.
In the bowl of a stand mixer fitted with the paddle attachment, beat the monk fruit sugar and cream cheese until smooth, about 2 minutes.
Crack the eggs into the mixer and lemon juice. Stir on low speed until just barely combined.
Remove the paddle attachment, and stir in the sour cream with a spatula. Do not overmix.
Scrape the cheesecake filling into the cooled crust, and smooth out the top with your spatula.
Dot the cooled blueberry jam over the surface and use a butter knife to drag it through the batter, creating a swirled effect.
Place the pan in the centre of the oven, and bake for 60-70 minutes, or until the cake is mostly set, with a slight jiggle in the middle. Try not to open the oven door during the baking process.
Turn off the oven, open the door, and let the cake slowly cool in the oven for 15 minutes. This prevents cracking from cooling too quickly. THIS STEP IS A MUST it works.
Remove from oven and cool completely on a wire rack. Cover loosely and chill in the refrigerator overnight.
To serve – sprinkle fresh blueberries over top, cut into 2-inch squares, and serve.