INGREDIENTS
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18 tablespoons (2 1/4 sticks) unsalted butter, at room temperature
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3 cups sugar
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6 extra-large eggs, at room temperature
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8 ounces (about 1 cup) sour cream, at room temperature
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1 1/2 teaspoons pure vanilla extract
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1 lemon, zested
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3 cups all-purpose flour
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1/3 cup cornstarch
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1 teaspoon kosher salt
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1 teaspoon baking soda
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24 ounces semisweet chocolate chips
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1 1/2 cups heavy cream
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2 tablespoons light corn syrup
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1/2 teaspoon pure vanilla extract
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4 tablespoons (1/2 stick) unsalted butter, at room temperature
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Chocolate candies for decorating (recommended: M&M's)