Sprouted Green Goddess Protein Sandwich

Ingredients

• 1/4 cup basil
• 1/4 cup chopped chives
• 1/4 cup mayonnaise
• 1/4 cup plain whole-milk Greek yogurt
• 2 Tbsp. extra-virgin olive oil, plus more for drizzling
• 1 lemon, halved, divided
• Kosher salt, freshly ground black pepper
• 1/4 English hothouse cucumber, thinly sliced
• 1 scoop Unflavored Super Youth
• 4 slices multigrain bread
• 1 avocado, thinly sliced
• 8 oz. mozzarella, sliced 1/4" thick
• 2 cups sprouts (such as alfalfa or broccoli)