Add all cheesecake ingredients to a blender and blend until completely smooth.
Pour the batter into a parchment-lined 6-inch round baking dish.
Bake at 325°F (165°C) for 40 to 45 minutes, until the edges feel lightly set and the center is still soft and slightly jiggly. It should look slightly underbaked in the middle.
Cool completely, then refrigerate for at least 8 hours, preferably overnight.
Before serving, spoon blueberry jam over the top and finish with fresh blueberries.
Slice and serve.
Notes
Do not overbake. The cheesecake firms up as it chills and keeps its fudgy texture.
Almond flour creates a slightly richer bite, while oat flour keeps things lighter.