In a sauce pan, melt 6 tbsp of butter with 1 cup brown sugar. Once melted keep on very low heat and add in flour, pecans, cayenne, sage, & rosemary. Lastly, stir in the bacon. Allow mixture to blend evenly on pecans and bacon, bring to a small boil and then allow to sit for a few minutes.
Preheat oven to 375 degrees F. And scoop out the inside of the baked sweet potatoes into a large mixing bowl. Mash until all bumps are out. Mix in the remaining brown sugar, vanilla, cinnamon, milk, 4 tbsp butter, maple syrup, eggs, and bourbon until combined. Season with salt and pepper.
Spoon the sweet potato mixture into a casserole baking dish. Then pour pecans over the top and garnish with fresh sage.