01 -
Preheat oven to 350°F (180°C). Line a 9 x 13-inch baking tray with parchment paper or grease it thoroughly.
02 -
In a large bowl, beat the softened butter and caster sugar together until pale and fluffy.
03 -
Incorporate the eggs one at a time, mixing well after each addition to maintain a smooth mixture.
04 -
Fold in the self-rising flour gently. Stir in the milk and vanilla extract to loosen the batter.
05 -
Fold in most of the sprinkles, reserving a tablespoon for topping.
06 -
Spread the batter evenly into the prepared tray. Scatter the remaining sprinkles across the surface.
07 -
Bake for 25 to 30 minutes, or until golden and a skewer inserted in the center comes out clean.
08 -
Allow the cake to cool completely in the tin before cutting into squares or bars for serving.