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Preheat oven to 350°F Mix flour, baking powder, cinnamon and salt in medium bowl; set aside.
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Mix brown sugar, butter, eggs, vanilla and pecans in large bowl until well blended. Add flour mixture; mix well. Reserve 1 cup of the batter. Spread remaining batter into lightly greased foil-lined 13x9-inch baking pan. Bake 15 minutes or until firm.
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Microwave caramels and milk in microwavable bowl on HIGH 2 to 3 minutes or until caramels are completely melted, stirring every minute. Pour over baked layer in pan, spreading to within 1/2 inch of edges. Drop reserved 1 cup batter by spoonfuls over caramel layer. Cut through batter with knife several times for marble effect.
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Bake 15 to 20 minutes longer or until center is set. Cool in pan on wire rack. Lift from pan; remove foil. Cut into 24 bars.