Preheat oven to 220ºC.
Combine the water and butter in a pan over medium heat. Once the butter has started to melt, sprinkle in the cheese and stir until the cheese has fully melted into the sauce.
Add the garlic powder and plain flour and stir until the flour is fully incorporated and sticks together like a dough. Stir over the heat for about one minute to allow the flour to cook. Remove from the heat and allow it to cool for about 5 minutes before beating in the eggs.
Stir in the sweet potato and baking powder until the mixture is smooth and silky.
Take a baking tray lined with parchment paper, then using a spoon or small ice cream scoop, divide the mixture into baby-sized portions, roughly 1 tablespoon per portion.
Bake for 25 minutes until golden brown, then leave to cool fully before serving.
Store in an airtight container in the fridge for 5 days, or freeze for a quick handy finger food.