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Preheat oven to 350°. Lightly grease a 13x9" pan with butter, then line with parchment, leaving an overhang on both long sides; butter parchment. Pulse flour, granulated sugar, baking powder, salt, and baking soda in food processor until combined. Add 10 Tbsp. butter and pulse until mixture is sandy. Add eggs, sour cream, and vanilla and pulse continuously until mixture is very smooth and homogenous, about 2 minutes. Scrape down sides and pulse once more.
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