Preheat oven to 350°F (175°C) and line a baking sheet with parchment paper.
Score the sourdough loaf in a crosshatch pattern, leaving the bottom intact.
Tuck Brie slices and spoon cranberry sauce evenly into the cuts.
Combine melted butter, garlic, herbs, salt, and pepper. Brush mixture over the loaf.
Cover with foil and bake 15 minutes, then uncover and bake 10–12 more minutes until golden and melty.
Garnish with rosemary and thyme; serve warm.
