Oven temperature: 350℉ (180℃).
Grease the pans using butter or a spray, line the bottom with parchment paper, then dust the sides with flour. Set aside.
In a stand mixer or using a handheld mixer, cream the butter and sugar until very light and fluffy. It will begin to pale in color, too.Add about one third of the beaten eggs, and continue to beat medium speed.
Now add about a third of the sifted flour. Repeat this step, then add the rest of the eggs and mix well. Turn the mixer to low and add the final flour and the whiskey and mix until well combined, but do not over mix.
Using a scale, divide the mixture evenly between the two tins and place in the center of a preheated oven for about 35 minutes. If you don't own a scale (I highly advise it for best baking results) just eye it. Since ovens vary greatly, do not open the oven until you start to smell the cake and it looks well risen (through the glass).
Carefully check that the cake is done with a cake tester or thin skewer. If it is too raw, the cakes will fall and you won’t be happy, so the previous step is important.
When the cake is done, remove them from the oven and allow to cool for about 15 minutes before removing from the tins.
To remove: place a cooling rack over the top of the cake and flip it over quickly. Remove from the tin, peel off the parchment paper and allow to cool completely before filling.