INGREDIENTS
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1/2 cup unsalted butter, softened
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1/2 cup granulated sugar
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1 large egg
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2 1/2 teaspoons vanilla extract, divided
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1/2 teaspoon butter extract
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1/2 teaspoon baking soda
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1/2 teaspoon cream of tartar
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1/2 teaspoon salt
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2 cups flour
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1/3 cup sprinkles, plus more for the top
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1 1/2 cups milk or semi-sweet chocolate chips
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1/2 can fat-free sweetened condensed milk, about 5 ounces (just over 1/2 cup)