Greas the pan 23cm ×33 cm

Line base sides with baking paper

Beat butter sugar and vanilla

In a bowl with electric mixer

Beat in eggs one by one until combined

Add milk and sifted flour stir until combined

Divide mixture equally among four bowls

Tint each with different colours

Spone mixture into prepared pan

Alternating between colours

Bake in preheated oven 160 c

Bake for 50 minutes or until skewers came out clean