In soften butter start whisking sugar. When sugar dissolves completely

Add eggs 1 by 1. Don't put both eggs together it may curdle

Now add flour slowly slowly.

Grease the cake tray.

Put batter in different cups/bowls to add colour separately

Now pour batter in cake tray in a manner were all colours are visible. (Right yellow, middle green left red)

Bake according to oven instructions manual (180 degrees pre heated 250 degrees)