In a medium heatproof saucepan, whisk together cream, almond milk, almond flour, Truvia, crushed saffron and cardamom.
Heat over medium heat until the mixture is boiling, whisking frequently to prevent lumps. Once the phirni boils, turn down the heat to maintain a lazy boil, and cook until the mixture is about the consistency of a thin pancake batter.
Refrigerate or 1-2 hours. Sprinkle with additional ground cardamom before serving.
If you aren't keto and want to make this, buy coarsely ground rice flour or whirl about some rice in your blender, until you get a coarse finish and substitute that for the almond flour.