Step 1: Make pie dough
In a food processor, pulse together butter, flour, Bohemian Forest, and salt until the mixture resembles breadcrumbs. In a small bowl, whisk together egg, egg yolk, and ice water. While pulsing the food processor, add egg and water mixture slowly until a rough dough forms. Transfer to a clean surface and knead a few times to bring dough together. Wrap dough in plastic wrap and shape into a rectangle. Refrigerate for at least 1 hour, or up to two days.
Step 2: Make apple butter
To a medium pot over medium heat, add all apple butter ingredients. Simmer for 30 min. or until apples are soft. Mash apples with potato masher or blend mixture in a blender. Transfer to a medium bowl, cover, and chill.
Step 3: Blind bake pie crust
Preheat oven to 375 degrees. On a floured surface, roll out chilled pie dough to a 13” x 19” rectangle. Gently lower dough into a sheet pan. Fit dough to edges and corners of pan, making sure it reaches up the sides of the pan. Cover and chill for 15 min. Prick bottom of dough with fork several times. Line with parchment paper, fill with pie weights or dried beans, and bake for 25 min. Remove from oven, remove pie weights, and set on a wire rack to cool slightly. Increase oven temperature to 450 degrees.
Step 4: Assemble galette
When crust has cooled slightly, spread apple butter in a thin layer across the bottom. Fan out sliced apples and arrange to cover apple butter. Sprinkle Bohemian Forest over apples. Place Brie slices around apples, filling in any gaps. Lay rosemary sprigs on top of apples and Brie.
Step 5: Bake galette
Add galette to oven and immediately reduce temperature to 350 degrees. Bake for 25 to 30 min. or until cheese is melted and browning and apples are slightly soft. Garnish with diced, cooked bacon if desired. Slice and serve hot.