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Preheat the oven to 350 F. Line a 9X13 pan with parchment paper, with an overhang on the 2 long sides. Lightly spray the parchment with baking spray.
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Whisk together the flour, salt and baking powder in a large bowl.
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Add everything but the add-ins to the bowl. Using a handheld mixer, preferably electric, beat for 1 minute on medium speed. Scrape the sides and bottom of the bowl and beat for an additional minute.
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Fold in any add-ins (if using--I did not).
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Spread the batter evenly into the prepared pan.
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Bake for 30-35 minutes, until a cake tester inserted into the center of the cake comes out clean or with only a few crumbs attached.
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Let cool in pan for 15 minutes.
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Working carefully and quickly to prevent breakage, lift the cake out by the parchment paper and place it on a cooling rack (still on top of the parchment paper). Let cool completely before slicing or frosting.