Cream the butter with the sugar until light and fluffy.
125 g unsalted butter, 125 g golden caster sugar
Break in the eggs, one by one, beating well between each egg.
2 large eggs
Beat in the mashed banana, if using, until well combined.
1 banana
Sift in the flour, baking powder and bicarbonate of soda, discarding any particularly large pieces of bran left in the sieve.
125 g flour, ¾ tsp baking powder, ¼ tsp bicarbonate of soda (baking soda)
Stir in the mincemeat.
4 tbsp mincemeat
Spoon into 10 muffin cases, unless you add the banana. In which case spoon into 12 muffin cases.
Bake at 180℃ (160℃ fan, 350℉, Gas 4) for 15 minutes until risen and golden.
Place on a wire rack to cool. Sprinkle with a little icing sugar once cooled, if liked.
Notes
Please note: calories and other nutritional information are per serving. They're approximate and will depend on serving size and exact ingredients used.