Heat oven to 350℉. Place baguette slices on a baking sheet, brush with olive oil, and season lightly with garlic powder. Bake until lightly toasted, 8-12 minutes. Remove from the oven and let cool on the baking sheet.
Meanwhile, toss lettuce, tomatoes, bacon, and blue cheese in a small bowl, then dress with blue cheese dressing. Top each crostini slice with the salad mixture, then garnish with chives and freshly ground black pepper. Serve immediately. Enjoy!