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Preheat the oven to 325 degrees. Spray 2 large baking sheets with cooking spray and set
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aside.
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Combine the butter and sugars in a large mixing bowl and beat with an electric mixer on
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medium for 3 or 4 minutes, until very light and creamy.
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Beat in the egg, egg yolk, and vanilla to combine.
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In a small bowl, whisk together the flour, baking soda, and salt. Turn mixer to low and
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gradually beat the flour mixture into the butter-sugar mixture until just combined. (The dough will be quite thick.)
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Use a rubber spatula to mix in the caramel bits and chopped Twix bars.
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Shape dough into balls of about 2 tablespoons of dough. Arrange on prepared baking
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sheets about 3 inches apart.
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Bake 10 to 15 minutes, until light golden around the bottom edges. Cool on
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baking sheets for 2 minutes, then use a thin metal spatula to transfer cookies to wire racks
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to cool completely. Serve.