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Preheat your oven to 350 degrees F.
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Grease and flour 9-inch-diameter springform pan (springform is best for an easy release; If using a standard pan, trace and cut out a parchment circle for the bottom, and grease and flour that as well.)
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Combine dry ingredients in a small bowl, stirring until evenly distributed. Set aside.
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In a large bowl, sing electric mixer, beat the butter until fluffy, about 30 seconds.
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Add brown sugar, and cream together the butter and the sugar until fluffy, about 1 and 1/2 minutes.
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Add eggs, one at a time, beating to combine between each addition.
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Add 1/3 of the flour mixture and beat to combine. Add 1/2 of the sour cream and mix to combine. Repeat until all has been added, ending with the flour mixture.
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Transfer batter to prepared pan.
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Bake cake until top is golden and tester inserted into center comes out clean, about 45 minutes.
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Cool cake 10 minutes.
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Cut around pan sides; release pan sides (if standard round pan, flip over carefully with a rack to remove from pan).
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Cool cake completely on rack.