Sweet Potato Falafel Lettuce Cups

Name: Sweet Potato Falafel Lettuce Cups
Ingredients: 1 medium sweet potato, peeled and finely grated; 1 (15-oz) can chickpeas, rinsed and drained; ⅔ cup rolled oats, ground to a find powder in a blender or food processor; ¼ cup fresh parsley, finely chopped, divided; ½ small yellow onion, minced; 1 large egg, beaten; 2 tbsp natural peanut butter; 2 cloves garlic, minced; ½ tsp paprika; ½ tsp curry powder; Salt; Pepper; ¼ cup plain 2-percent-fat Greek yogurt; 1 pinch lemon zest (optional); ½ lemon, juiced; 1 tbsp fresh dill, chopped; 1 tsp olive oil; 10 butter lettuce leaves (or romaine leaves)