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1
Set oven to 350 degrees.
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2
Set oven rack to second-lowest position.
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3
Butter a 13 x 9-inch baking pan.
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4
For the crust; in a large bowl mix together the cake mix with oatmeal, brown sugar and cinnamon.
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5
In a small bowl whisk together the melted butter, lemon juice and egg until well blended; add to the oat mixture, using clean hands combine the ingredients until mixture barely holds together.
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6
Sprinkle two-thirds of the oat mixture into the bottom of the pan; pat down with hands to spread evenly.
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7
Bake for 5 minutes.
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8
Remove from oven and sprinkle the partially baked crust with chocolate chips then nuts.
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9
For the filling; in a bowl combine combine the caramel topping with 3 tablespoons flour; blend well, then drizzle over the chocolate and nuts.
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10
Sprinkle with remaining oat topping, then gently press the oat mixture down slightly.
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11
Bake for 20 minutes or until the top is lightly browned).
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12
Let stand to cool enough to refrigerate, then chill.
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13
Slice into squares or bars.
