Using a hand mixer, cream salted butter in a large bowl for about two minutes until smooth and creamy.
Add light brown sugar and cream for about two minutes until smooth and creamy.
Add dark brown sugar and cream for about two minutes until smooth and creamy.
Add both Karo syrups and beat until smooth.
Add six eggs and vanilla extract and beat until everything is combined.
Line a large rimmed baking sheet with non-stick aluminum foil and place both frozen pie crusts on the prepared pan.
Fill each crust with 1 ½ cups of toasted pecans.
Using a soup ladle, ladle the filling on top of the pecans, but do not over fill your pie crusts. You will have a little bit of filling left over. If you try and use all of your filling the filling will spill over during baking.
Bake in a 450° oven for 10 minutes. then reduce the oven temperate rot 350° and bake for 50 minutes.
Remove the pan from the oven and cool on a wire rack. When the pan is cool to the touch, remove the pie from the pan and continue cooling on the rack until they are at room temperature.
Store the pies in gallon size freezer Ziplock bags for up to one week.