For Meatballs: Place turkey and breadcrumbs in a large bowl.
Combine onion, red bell pepper, garlic, and cilantro in a food processor and pulse until finely chopped (but not pureed).
Pour into bowl with turkey, and add milk, eggs, paprika, oregano, salt. Use your hands to mix well.
Line a baking sheet with foil or parchment paper. Shape meat mixture into 1" balls and arrange on pan.
Heat oil in a large skillet over medium heat. Cook meatballs in batches until browned on all sides. Return all meatballs to pan and add remaining broth. Let simmer over low heat until the broth is mostly absorbed.
For Cilantro Aioli: Combine mayonnaise, milk, garlic and cilantro in a blender or food processor and puree until smooth. Serve meatballs hot with dipping sauce.