Warm oven to 180°C Oil a muffin tin or use paper cups. Shift flour, baking powder and sugar in a big bowl. In another bowl mix together the eggs, butter, sour cream, milk and banana. Add this mixture to the dry ingredients and fold everything inches The mix should be a little chunky. Stir in the chopped dates. Fill each muffin to 2/3.
Bake 20 to 25 minutes, or until muffins are golden and a skewer comes out clean when inserted. Let rest for a couple of minutes then transfer to wire rack. Can be eaten warm or at room temperature. Cream cheese or butter to serve, optional.