Position a rack in the middle of oven and preheat oven to 350. Spread the oats on a rimmed baking sheet and toast in the oven for 10-12 minutes, stirring occasionally. Set aside to cool. Reduce oven temp to 325.

Chocolate Ganache: Bring the heavy cream just to a boil over medium heat in a heavy sauce pan. Removed from heat and add chocolate. Swirl the cream around to cover the chocolate and let sit for 5 minutes. Whisk gently until smooth. Spread chocolate into bottom of cooled pie shell and place in the freezer while making the filling.

Filling: In a large bowl, whisk together the brown sugar, salt and melted butter. Add the corn syrup, vanilla, and vinegar and whisk to combine. Add the eggs, one at a time, blending well after each egg. Stir in the cooled oats.

Place the the ganache coated pie shell on a rimmed baking sheet and pour in the filling. Bake on the middle rack for 30-35 minutes or until the edges start to set. Now turn pan 180 degrees and bake for another 20-25 minutes or until the center is slightly firm to the touch and the pie is puffed slightly. The center should feel firm to the touch, but still have some give. Allow to cool completely on a wire rack for 2-3 hours. Serve warm or at room temperature. If you chill it, the taste resembles a candy bar.