Preparation

• Prepare a medium-high grill fire. Grill the bell peppers, turning occasionally, until the skin chars all over, 15 to 20 min. Put the charred peppers in a heatproof bowl, cover with plastic wrap, and let sit until cool enough to handle, about 30 min.
• Meanwhile, in a large bowl, combine the balsamic vinegar, olive oil, 1/2 tsp. of the thyme, salt, and about 5 grinds of pepper. Mix well.
• Remove the pepper skins and seeds and cut the peppers into thin strips. Add the peppers to the vinegar mixture and let them marinate for at least 1 hour and up to 3 days. (Refrigerate if making more than a few hours ahead and return to room temperature before assembling the crostini.
• Spread each slice of the grilled garlic bread with a generous layer of goat cheese, sprinkle with some of the remaining thyme, and top with a tangle of the peppers and a small grind of black pepper. Serve immediately.