Combine ground beef, breadcrumbs, Parmesan cheese, parsley, egg, garlic, onion powder, salt, black pepper, and red pepper flakes in a large mixing bowl. Mix until well combined.
Shape the mixture into meatballs about 1 inch in diameter and place them on a baking sheet.
Preheat oven to 400°F (200°C) and bake meatballs for 20-25 minutes until cooked through and browned.
Boil cubed sweet potatoes in water for 15 minutes until tender. Drain and mash with heavy cream, seasoning with salt and pepper.
In a saucepan, combine maple syrup and olive oil. Heat over medium for 2-3 minutes until slightly thickened.
Drizzle sticky maple sauce over cooked meatballs and serve with creamy sweet potato mash.