Shoofly Pie

Ingredients (14)

• Dough for single-crust pie
• 1/2 cup packed brown sugar
• 1/2 cup molasses
• 1 large egg
• 1-1/2 teaspoons all-purpose flour
• 1/2 teaspoon baking soda
• 1 cup boiling water
• 1 large egg yolk, lightly beaten
• TOPPING:
• 1-1/2 cups all-purpose flour
• 3/4 cup packed brown sugar
• 3/4 teaspoon baking soda
• Dash salt
• 6 tablespoons cold butter, cubed