Green Goddess Veggie Sandwich

Ingredients

• 2 tbsp mayonnaise
• 1/4 cup sour cream
• 2 tbsp fresh parsley, finely chopped
• 2 tbsp fresh chives, finely chopped
• 1 tbsp fresh dill, finely chopped
• 1 tbsp lemon juice
• 1 garlic clove, minced
• 1/4 tsp kosher salt
• 1/4 tsp onion powder
• fresh ground black pepper
• 4 sliced of sourdough bread
• 1 cup lettuce (romaine or mixed greens)
• 1 avocado, sliced
• 1/4 cup crumbled feta cheese
• 4–5 green onions, thinly sliced
• 1 english cucumber, thinly sliced