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Preheat oven to 350°F.
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Lightly grease a 9 x 13" baking pan; set aside.
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In a large mixing bowl, mix together the brown sugar and flour.
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Using a pastry cutter or two knives, cut in butter until mixture resembles coarse crumbs.
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Remove 1 cup of mixture and set aside.
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To mixture in large bowl, add baking powder and salt.
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Using a fork, lightly beat in vanilla, milk and egg.
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Continue beating until a smooth batter forms.
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Pour batter into prepared baking pan.
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In a small bowl, combine the chocolate chips and walnuts.
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Fold in the coconut.
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Sprinkle reserved crumb mixture over top of batter in pan.
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Sprinkle with the chocolate chips and walnuts.
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Using a long flat spatula, spread topping evenly over the top of the batter in pan.
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Bake bars for 35 minutes, or until a skewer inserted in center comes out clean.
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Transfer pan to wire rack.
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Cool bars in pan completely before slicing.
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Using a serrated knife, cut into 24 bars.
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Store in airtight container for up to 5 days.