Preheat your oven to 400 degrees F. Poke a few holes in the sweet potatoes and bake for 1 hour or until soft and tender. When the sweet potatoes are cooked, slice them in half and allow to cool.Meanwhile, make the bacon pecans. In a large skillet over medium heat, cook the bacon until crisp. Remove the bacon from the pan and drain onto a paper towel. In a medium bowl, combine the brown sugar, flour, pecans, butter, cayenne, sage, and rosemary (if using). Stir in the bacon.Reduce the oven temperature to 350 degrees F. Peel the skins away from the flesh of the sweet potato. Add the sweet potatoes to a mixing bowl. Mash well. Mix in the brown sugar, vanilla, cinnamon, milk, butter, eggs, and bourbon until combined. Season with salt.Spoon the sweet potato mixture into a 9x13 inch baking dish. Sprinkle the pecans evenly over top. Transfer to the oven and bake for 35-40 minutes, until the pecans are golden. Serve warm topped with flaky sea salt.