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Preheat oven to 350 degrees.
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In a medium saucepan over low heat, melt together the caramels and heavy cream, stirring occasionally until smooth.
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In a medium bowl, stir together the flour, oats, brown sugar, baking soda and salt.
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Stir in the melted butter until well blended.
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Press Half of the mixture into the bottom of a 9x13 inch baking pan.
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Reserve the rest.
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Bake the crust for 8 minutes in the preheated oven.
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Remove and sprinkle with chocolate chips and walnuts.
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Pour the caramel mixture over the top and then crumble the remaining crust mixture over everything.
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Return to the oven and bake for an additional 12 minutes, or until the top is lightly toasted.
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Cut into squares while it is still warm.