Spicy Chicken Sandwiches with Cilantro-Lime Mayo

INGREDIENTS

• 1/4 cup reduced-fat mayonnaise
• 2 tablespoons chopped fresh cilantro
• 1 teaspoon fresh lime juice
• 1 garlic clove, minced
• 1/4 cup egg substitute
• 3 tablespoons hot sauce (such as Tabasco)
• 1 teaspoon dried oregano
• 1/4 teaspoon salt
• 2 (6-ounce) skinless, boneless chicken breast halves
• 4 1/2 ounces baked tortilla chips (about 6 cups)
• 2 tablespoons olive oil
• 4 (2-ounce) Kaiser rolls, split
• 12 (1/8-inch-thick) red onion slices
• 4 lettuce leaves