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Preheat the oven to 350 degrees.
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Place the crust in a pie plate and prick the bottom with a fork.
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Cover lightly with a sheet of foil, pressing it gently into the crust and making sure the edges are covered.
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Place weights (metal pie weights or dried beans) on the foil to weigh down the bottom and hold up the sides of the crust.
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Bake for 10 minutes, then remove foil.
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Continue baking until the crust is firm and has lost its sheen but is not browned, about 5 more minutes.
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Remove from the heat and set aside.
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In a medium bowl, combine the butter, eggs and vanilla extract.
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Add the brown sugar and flour and mix until thoroughly blended.
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Using a rubber spatula, fold in the walnuts and chocolate chips.
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Pour the batter into the crust.
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Bake until puffed and golden brown, about 30 minutes.
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Remove from the heat and place on a rack to cool.
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Serve warm.
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(cook time includes blind bake time).