This is totally optional, but I love how it looks! Drill holes in the cupcake trays with 2 ⅛” hole saw. Start by finding the center point and then evenly spacing the remaining holes.

Preheat the oven to 170C/325F/Gas 3. Line a 12-hole muffin tray with paper cases. Beat the butter and sugar together until light and creamy. Gradually beat in the eggs until well combined.