Line a springform pan with parchment paper.
In a food processor, pulse graham crackers and brown sugar until fine.
Add coconut oil and pulse until combined.
Press mixture firmly into the pan and freeze until firm.
In a bowl, whisk powdered sugar into the skyr yogurt.
In a separate bowl, whip the cream until stiff peaks form.
Gently fold the whipped cream into the yogurt mixture.
Spread the filling over the crust and smooth the top.
Tap the pan lightly to remove air bubbles.
Cover and refrigerate overnight.
When ready, release from the pan and serve. This Blueberry Icelandic Skyr Cake is best served chilled with toppings.