Cream butter n condensed milk
Emulsify egg yolk one at a time to creamed butter mixture till all well combined.
Sift flour, baking powder, spices and salt and then fold into the egg yolk mixture.
Whisk white with some sugar till stiff peak.
Divide egg white mixture into 3, and fold into egg yolk mixture 1/3 at a time.
Heat grill to 280C.
Line a 20cm square pan completely.
Place 120g of mixture into the pan and grill for 3 minutes (watch and adjust accordingly).
Remove from grill when desired brown-ness is reached.
Place another 120g of mixture into the pan and repeat the process until the mixture is depleted.
Turn the temperature to 180C and bake for another 15 minutes.