Creamy Cucumber Soup

Serves:

• 1 tablespoon extra-virgin olive oil
• 2 cloves garlic, minced
• 1 small onion, diced
• 1 tablespoon lemon juice
• 4 cups peeled, seeded and thinly sliced cucumbers, divided
• 1 1/2 cups vegetable broth or reduced-sodium chicken broth
• 1/2 teaspoon salt
• 1/4 teaspoon freshly ground pepper
• Pinch of cayenne pepper
• 1 avocado, diced
• 1/4 cup chopped fresh parsley, plus more for garnish
• 1/2 cup low-fat plain yogurt