Preheat oven to 350°.

In a medium bowl, combine
 flour, brown sugar, pumpkin pie spice, and cinnamon. Stir in pecans. Add melted butter, stirring to combine. Spread mixture into an ungreased 13x9-inch baking pan. Bake, stirring occasionally to crumble, until lightly browned, 15 to 20 minutes. Let cool completely. Store in an airtight container.