Red Leaf Salad with Ranch Dressing

Ingredients

• 6 oz. ciabatta or baguette, cut into 1" pieces
• 1⁄4 cup olive oil
• Kosher salt
• freshly ground black pepper
• 2 tbsp. white wine vinegar
• 3 cloves garlic, mashed into a paste
• 1 1⁄4 cups plain full-fat Greek yogurt
• 1⁄2 cup buttermilk
• 2 tbsp. finely chopped chives
• 2 tbsp. finely chopped parsley
• 1 tbsp. finely chopped tarragon
• 1 tbsp. finely chopped thyme
• 1 1⁄2 tsp. Dijon mustard
• 1⁄2 tsp. dried dill
• 1⁄4 small yellow onion, grated
• 2 heads red leaf lettuce, trimmed and torn into 2" pieces
• 1 pint cherry or grape tomatoes, halved
• 1⁄2 small red onion, thinly sliced