Heat oven to 425° F. Slice baguette into ½ inch rounds. Mix olive oil and butter, and lightly brush each side of bread. Place on a lined baking sheet.
Bake for 8-10 minutes until lightly browned, turning halfway through. Set aside to cool.
Optional- for garlic crostini, rub the cut side of garlic over the top of each toast immediately after removing from oven.
Meanwhile, in a medium-sized mixing bowl, add cranberries, balsamic vinegar, lemon juice, lemon zest, sugar, honey, rosemary and thyme. Stir until combined.
Pour mixture into a shallow oven-proof dish, spread into a single layer, and bake for 15-20 minutes until cranberries burst open and liquid is syrupy (carefully shake pan back and forth halfway through to turn cranberries). Allow to cool.
To assemble each crostino, add a thin slice of brie topped with a teaspoon or so of cranberry compote.
Optional- garnish with a sprig of fresh thyme or rosemary for a festive look.