In the bowl of your electric mixer, or with a hand mixer, beat the butter until soft (about 1-2 minutes). Add the sugar and beat until light and fluffy (about 3-4 minutes). Scrape down the sides of the bowl as needed. Add eggs, one at a time, beating well after each addition. Beat in the vanilla extract. Then, with the mixer on low speed, alternately add the flour mixture (in three additions) and milk (in two additions), beginning and ending with the flour. Beat just until combined.
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