Step 1: Preheat your oven to 425°F (220°C). Wash and dry the peppers, slice them in half, remove the seeds, and place them cut-side down on a baking sheet.
Step 2: Drizzle the peppers with 1/3 cup of olive oil, sprinkle with coarse salt and black pepper, and roast for about 25-30 minutes, until the skins are blistered and charred.
Step 3: Slice the rustic bread into 1/2-inch thick pieces. Brush both sides with 2 tablespoons of olive oil and toast in the oven for about 5-7 minutes until golden brown.
Step 4: After roasting, allow the peppers to cool slightly, peel off the charred skins, and slice them into strips.
Step 5: Assemble the crostini by placing roasted pepper strips on the toasted bread, drizzling with olive oil, and adding fresh herbs if desired.