Preheat the oven to 325°F (165°C) and line a muffin tin with cupcake liners.
In a large mixing bowl, combine the almond flour, Erythritol, protein powder, coconut flour, baking powder, cinnamon, and a pinch of salt.
Add the butter, eggs, almond milk, and vanilla to the dry ingredients and mix until well combined.
Pour the batter into the prepared lined muffin tin.
Top each with a tablespoon of the topping and bake for about 30 minutes or until a toothpick inserted in the center comes out clean.
Allow to cool in the pan before removing before glazing.