• Preheat oven to 350°F for dark pans and 325°F for glass pans.

For the Crust

• Lightly grease a 9 x 13-inch pan and then line with parchment paper
• Mix together flour and sugar in a bowl
• Using a pastry dough cutter or two forks, "cut" cold butter into flour mixture, until beads of butter are throughout the mixture
• Lightly press the dough into the parchment paper lined pan to form crust
• Bake for 20 minutes until edges are just beginning to brown.
• Pour pecan pie filling into crust immediately.

Pecan Pie Filling

• Mix melted butter and brown sugar in a medium bowl.
• Stir in eggs, then the flour.
• Whisk in syrup, vanilla and pecans.
• Pour into HOT baking dish after crust has baked for 20 minutes.
• Bake for 10 minutes before adding crumble topping to keep layers separate.

Crumble Topping

• Add flour, brown sugar and oats to bowl.
• Pour melted butter over flour, brown sugar and oats and stir to combine using a fork.
• Break up larger chunks into small, course "pebbles" of oat mixture.
• Pour over pecan pie filling layer and carefully spread over bars evenly.
• Bake for 30-45 minutes until pie filling layer is solid.
• Remove the parchment paper (with pie bars on top) and place on a cooling rack to cool.
• Use a sharp knife to cut bars on top of a cutting board. Cut off any edges if they are too hard to eat.