–– 210 g (1 1/2 cups) all-purpose flour – 3/4 teaspoon baking soda – 1/4 teaspoon salt – 165 g (3/4 cup) granulated sugar – 1 large egg – 1 large egg yolk – 1 teaspoon vanilla extract – 113 g (1/2 cup) unsalted butter, melted – 50 g (1/3 cup) rainbow sprinkles, plus more for sprinkling
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