Easy 5-Minute Keto Blueberry Mug Cake

(0.5oz/16g) finely ground almond flour

(0.5oz/16g) finely ground coconut flour

(1oz/28g) granulated erythritol

(50g) frozen blueberries

egg

unsweetened almond milk

melted butter or coconut oil

½ tsp (gluten-free) baking powder

½ tsp sugar-free vanilla extract

Optional: Blueberry Cream Cheese Topping

full-fat cream cheese

½ tbsp (4g) powdered erythritol

approx. a handful of mashed blueberries