Preheat the oven to 375°F (190°C) and line a muffin tray with cupcake liners.
In a large mixing bowl, whisk together the almond and coconut flour and mix with the Erythritol, matcha powder, baking powder and salt.
In another bowl, whisk together the eggs with the heavy cream, butter and vanilla extract.
Combine the two mixtures together.
Pour the mixture into the lined muffin tray and bake in the preheated oven for 10-15 minutes.
Allow to reach room temperature and optionally frost with your favorite keto frosting.