In a medium sauce pot, over medium to high heat, add diced sweet potatoes with a pinch of salt. Bring to a boil, then reduce to a simmer. Cook until tender, about 15 minutes. Drain and set aside.
In a medium skillet, over medium heat, add the bacon and pan fry until the bacon is crispy. Remove to a plate lined with paper towel. Allow to cool, then chop with a sharp knife. Set aside.
In a medium bowl, add the sweet potatoes and roughly mash them with a fork. Add olive oil, garlic, salt, pepper, rosemary and half the bacon. Combine the ingredients and taste to your likely. Add more seasoning if needed. Set aside.
Preheat oven to 400°F. Line a large baking sheet with parchment paper.
Remove the pastry dough from the refrigerator and roll it out on a lightly flour surface to a 12 inch circle. Then transfer to the lined baking sheet.
Spread the sweet potato mixture over the rolled out dough, leaving about 1-2 inches from the edges. Add the remaining bacon and crumble the goat cheese evenly. Fold the edges in creating a pleat design. Brush with egg wash and bake for 30 minutes until the crust is golden.
Remove the galette from the oven and allow to cool for 5 minutes. Add the smoked salmon and some rosemary.
Serve on it's own as an appetizer or with a lunch with a salad. Enjoy!