Preheat the oven to 450 degrees F. Line a baking sheet with parchment.Add the turkey, egg, bread crumbs, and a pinch each of salt and pepper to a bowl. Coat your hands with a bit of olive oil, and roll the meat into tablespoon size balls (will make 15-20 meatballs), placing them on the prepared baking sheet. Transfer to the oven and bake for 15 minutes or until the meatballs are crisp and cooked through.Meanwhile, heat the olive oil in a large skillet over medium heat. Add the onion and cook 5 minutes or until fragrant. Add the garlic and ginger, cooking another 5 minutes. Season with salt and pepper.Stir in the garam masala, curry powder, turmeric, and cayenne and cook until fragrant, about 1 minute.Add the tomato paste, coconut milk, and 1/2 cup water. Stir to combine, bring the sauce to a boil, cook 5 minutes or until the sauce thickens slightly. Stir in the yogurt and butter. Add the meatballs and cook, stirring occasionally, until the sauce thickens slightly, about 5 minutes. Remove from the heat and stir in the cilantro.Serve the meatballs and sauce over bowls of rice with fresh naan. Enjoy!