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Heat oven to 350*.grease a jelly roll pan.
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in large bowl, combine all base and topping ingredients, mix at low speed till crumbly --
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press half (2 1/2 cups) of mixture in bottom of greased pan.
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save rest for topping --
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bake at 350* for 8 minutes --
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meanwhile in small saucepan, combine caramel tipping, 1/2 cup flour, and blend well.
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bring to boil ovre medium heat, stirring constantly -- about 3-5 minutes -- or mixture begins to thicken slightly.stir all the time.
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remove pan from oven, sprinkle apples and walnuts over warm base.
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pour caramel mixture evenly over top.
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sprinkle with reserved topping mixture --
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return to oven, bake an additional 20-25 minutes or golden brown --
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cool 30 minutes.
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refrigerate 30 minutes or until set.