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Preheat the oven to 325 degrees F. Grease cookie sheets, or line them with parchment paper or use a Silpat.
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Mix the flour, salt and baking soda and set aside.
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Mix the sugar and butter just until thoroughly mixed, then add egg, yolk and vanilla and mix until creamy. Add the dry ingredients and mix until just blended.
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Stir in the chocolate chips, caramel chips, and walnuts, then drop dough 1/8 cup at a time on a cookie sheet, about 3 inches apart, and bake for 15-17 minutes. Leave them on the cookie sheet to cool a bit when removed from the oven (this is important... they fall apart if you move them too quickly). Once they cool a few minutes, remove the cookies to a cooling rack to finish cooling. Or eat them right away, with milk!