Preheat the oven to 180C/gas 4 and line two 12-hole muffin trays with cupcake cases.
Combine the dry ingredients in a bowl.
Beat the eggs, vegetable oil and sugar together till light and fluffy. Beat in the dry ingredients then stir in the apple. Spoon the batter into the cupcake cases and bake for 20–30 minutes till firm and lightly golden.