Place flour in bowl of electric mixer with paddle attachment.

In an electric mixer fitted with a paddle attachment, cream remaining butter.

For the dough, place flour, sugar and salt in a mixer with a paddle attachment.

In the bowl of a mixer fitted with a paddle attachment, cream the butter and the sugar on low speed.

Add sugar and beat, using the paddle attachment, until well combined.

Remove from heat and transfer to a standing mixer bowl fitted with a paddle attachment.

Place the flour and salt in the bowl of an electric mixer fitted with a paddle attachment.

In the bowl of a standing mixer fitted with a paddle attachment, beat the butter and sugar on high until well combined.

To make cake, in bowl of electric mixer fitted with paddle attachment, beat butter until light, about 3 minutes.

In a mixer fitted with a paddle attachment, cream the butter and sugar.