receipe kueh lapis :

Place the egg yolks, castor sugar and vanilla into mixing bowl. Beat to very high soft peak.
Stir in the layer cake extract, flour and butter. The batter should be very thick.
Place wax paper at the bottom buttered baking pan. Spread butter on top of the wax paper as well.
Pour 3-4 Tbs. of batter into the wax covered pan and bake .
Remove from oven and press the cake evenly and then spread butter (not to much, just for flavoring) on cake top. Pour another 3-4 Tbs. of batter and bake it again for five minutes. Keep doing this step until the batter is finished.