•Preheat the oven to 375 degrees F.
•In a small saucepan, combine 1/4 cup brown sugar, the molasses, egg, water, and the 2 tablespoons flour. Cook over medium heat, stirring constantly, until the mixture thickens. Remove from the heat, cool for 5 minutes, then stir in the vanilla; set aside.
•In a large bowl, combine the remaining 1 cup flour with the baking soda; add the remaining 1/4 cup brown sugar, the melted butter, and cinnamon, stirring with a fork until crumbly.
•Pour the molasses mixture into the pie shell; top with the crumb mixture, sprinkling evenly.
•Bake for 40 to 45 minutes, or until light golden. Cool before serving.
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