Unroll the pie crust into the pie plate (or make a homemade crust) and flute the edges or crimp decoratively as desired; set aside.
In a large bowl, add the eggs and whisk until foamy.
Add the corn syrup, brown sugar, melted butter, vanilla, salt and cinnamon; mix well.
Stir in the oatmeal.
Pour the mixture into the prepared pie crust and bake for 45-50 minutes, or until the center of the pie is set (there should be very little jiggle in the center).
Let cool for a few hours, or until the pie has set up.
Serve with ice cream or whipped topping, if desired.