Preheat the oven to 400°F and line a baking sheet with parchment paper.
In a large bowl, mix the chopped salmon, breadcrumbs, Parmesan cheese, egg, parsley, garlic, lemon juice, salt, and pepper until well combined.
Shape the mixture into small meatballs and arrange them on the prepared baking sheet.
Bake the meatballs for 15 to 18 minutes until cooked through and lightly golden.
While baking, prepare the avocado sauce by blending avocado, Greek yogurt, lime juice, garlic, salt, and pepper until smooth, adding water to reach the desired consistency.
Serve the salmon meatballs hot with the creamy avocado sauce on the side for dipping.