Once your keto angel food cake is cooked and cooled, cut the angel food cake into 1 inch cubes and place onto a baking sheet pan while you prepare the cheesecake filling.
Place mascarpone, vanilla extract and vanilla stevia in a stand mixer and blend using the paddle attachment until smooth.
Switch to the whisk attachment and pour in the heavy cream. Blend on low speed then increase speed as it incorporates until nicely combined. Taste and adjust sweetener if needed
Place cheesecake filling into a piping bag or my easy Wilton piping tool.
Assemble
Layer the bottom of each mason jar with cubes of cake.
Pipe cheesecake filling over cake. Add slices of strawberries.
Repeat with more cake over strawberries, pipe cheesecake filling, add blueberries.
Cover and refrigerate or serve with optional whipped cream.
Notes
Net carbs; 8g If you cut this recipe in half, you would make only one layer in your smaller mason jar instead of two. For example, fill the bottom with angel food cake, add layer of cheesecake filling, top with berries. Total carbs would be 4.5 grams and net carbs would be 4 grams.