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Preheat oven to 350 degrees and grease a 9 x 13 baking pan.
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In a large mixing bowl, use a hand mixer to mix butter and sugar, until fluffy.
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Beat in eggs and vanilla, until well blended.
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In a separate mixing bowl, whisk your flour and baking powder.
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Add your dry mix, and milk to your wet mix, and mix using your hand mixer. Do it slowly, about 1/4 at a time, and beat well with hand mixer. Make sure to scrape the sides and blend well.
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Fill your baking pan with batter, only about 2/3 of the way. You may have batter left over, depending on how deep your pan is.
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Bake for 20 minutes on middle rack. After 20 minutes, move to top rack, reduce heat to 320, and bake an additional 5 minutes, or until cake is baked through, and toothpick comes out clean.
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Let cool.