Preheat oven to 400 degrees F.
Poke the sweet potatoes all over with a fork and transfer to a parchment lined baking sheet. Roast the sweet potatoes for 1 hour, or until tender and they begin to ooze their sugars. With a shark knife, slice the sweet potatoes in half. Set aside to cool.
While the sweet potatoes are cooling, make the topping. In a large skillet heat 1 tablespoon of salted butter over medium high heat. Add the chopped pecans and toast until golden and fragrant, about 5 minutes. Be careful not to burn them! Once toasted, remove to a plate a set aside. Into the same skillet add the chopped bacon. Cook over medium heat until crispy and golden, about 5 minutes. In the last minute or cooking, add the fresh chopped rosemary. Add the brown sugar and stir well. Transfer the rosemary bacon bits to a plate lined with paper to towels to absorb excess grease. Set aside.
In a large dutch oven or soup pot, heat the maple syrup and cinnamon over medium high heat until it comes to a boil. Turn the heat down to a gentle simmer and allow the maple and cinnamon to cook down until it becomes a thick, honey like syrup stirring often. Remove from the heat and set aside.
When the sweet potatoes are cool enough to handle, use a spoon to scoop out the flesh. Discard the skins. Put the sweet potato filling into either a high powdered blender or food processor with 1 cup of the broth. Blend on high speed for 1-2 minutes until smooth and creamy. Pour the sweet potato puree into the pot with the cinnamon-maple syrup and stir well. Add the remaining chicken broth. Bring to a gentle simmer over medium heat and cook for 10-15 minutes, until slightly thickened.
Season the bisque with a dash of nutmeg and salt and pepper to taste. Add the bourbon whiskey and heavy whipping cream, and stir to combine. Allow to cook for 5 minutes more. Adjust any seasonings if needed. Ladle the bisque into serving bowls and top with desired amount of rosemary bacon bits and toasted pecans. ENJOY!