1¼ cups all-purpose flour
1/3 cup light brown sugar
1/3 cup granulated sugar
7 tablespoons unsalted butter, melted

1 ¼ cups all-purpose flour 1/3 cup light brown sugar 1/3 cup granulated sugar 7 tablespoons unsalted butter, melted

Combine the flour and sugars in a medium bowl; drizzle with the melted butter and toss with a fork until evenly moistened and the mixture forms many large chunks with pea-sized pieces mixed throughout. Sprinkle the streusel evenly over the pie filling. Set the pie plate on a baking sheet and bake until the streusel topping is deep golden brown, 10 to 20 minutes. Cool on a wire rack to room temperature and serve.