Preparation
Meanwhile, preheat oven to 400°. Rub a liberal amount of reserved bacon drippings evenly over each potato. Place sweet potatoes on a foil-lined baking sheet. Roast until tender, 45–55 minutes. Let sit until cool enough to handle.
In 1 tablespoon of reserved bacon fat, saute leeks until soft. Add garlic and cook for 2 more minutes. Stir in crumbled bacon. Remove from heat.
When potatoes are cool, scoop out insides and place in blender or food processor. Add 1 egg, 1/4 cup of cream, 2 tsp fresh rosemary, 1/2 tsp salt, and 1/4 tsp garlic powder. Process until smooth and creamy.
Rub potato skins with a couple tablespoons of honey. Spoon or pipe filling back into skins. Top with bacon-leek mixture. Bake for an additional 15-20 minutes, or until potato filling is slightly puffy and leeks are crisp.