How to Make It
Preheat oven to 425°F. Using a serrated knife, slice baguette crosswise at 1/2-inch intervals, cutting to within 1/4 inch of bottom of baguette (being sure not to cut all the way through). Place sliced baguette on a rimmed baking sheet; set aside.
Heat jam, butter, thyme, vinegar, garlic, pepper, and salt in a small saucepan over medium, stirring constantly, until butter is melted, about 3 minutes. (Makes 1 1/4 cups.)
Using a small spoon or small offset spatula, coat inside of each baguette slice with jam mixture. Stuff 1 cup of the cheese evenly in between slices. Sprinkle top of baguette with remaining 1/4 cup cheese. Bake in preheated oven until cheese is melted and browned in spots, about 7 minutes. Place on a serving platter. Sprinkle lightly with pepper; garnish with thyme.