Preheat the oven to 200 C. Brush oil on the bottoms of 12 regular sized muffin tins. Mix flour, sugar, paprika and baking powder in a bowl. Add the cheese, basil and sweet potato and mix well. In another bowl mix the milk, egg, and butter .Pour the egg mixture into the flour and fold in with a fork. Do not over mix.. it just has to be wet mostly through, it doesn't even matter if there are small areas of flour about. This is the main secret to good, light muffins. Spoon into muffin tins, filling each one about 2/3. Bake for 15 - 25 mins or until just starting to brown.