Preheat oven to 350 F. Place a round piece of parchment paper in the bottom of a 9” springform pan to prevent sticking.
Pulse graham crackers and oats in a food processor until small crumbs, transfer to a bowl and mix with coconut oil and vegan butter. Press into the bottom of the springform pan and refrigerate for about an hour. No baking required!
Put raw cashews, vegan cream cheese, coconut cream, vanilla sugar, lemon zest and juice, vanilla, cornstarch, salt, and the blueberries together in a high-speed blender (if you only have a regular blender, soak the cashews in boiling water for 10 minutes, drain and add). Blend until very smooth, making sure the cashews are broken down and creamy. Start on a slow speed and, once ingredients are well-blended, scrape down the sides and blend on high.
Remove crust from fridge, spray the sides and bottom of your springform pan with a neutral cooking oil spray, and pour in the filling. Drop gently, a few times, on the counter to release the air bubbles. Bake in oven for 50 - 60 minutes or until the top is slightly browned and the cake is firm. (Update: read the notes about using a water bath as an option to help prevent cracking!)
Once done, turn off oven, crack open door and let cheesecake cool inside the oven for about 45 minutes. This prevents the top from cracking as it cools. Then transfer to the counter until cooled completely. Finally, refrigerate overnight (at least 8 hours).
Run knife around outside of cake, if needed. Gently remove outside ring of springform pan, slice, and serve! To garnish, sprinkle with fresh blueberries.