INGREDIENTS
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1 cup butter, softened
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1 and 1/2 cups sugar
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2 large eggs plus 1 egg yolk
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1 teaspoon peppermint extract (or more to taste)
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about 10 drops of green food coloring
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3 and 1/4 cups flour, spooned and leveled
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2 teaspoons baking powder
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1 teaspoon baking soda
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1 teaspoon cream of tartar
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1/2 teaspoon kosher salt
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12 ounces dark chocolate chips, divided