Add the ground chicken to a large bowl with the egg, panko, Parmesan, parsley, heavy cream, smoked paprika, garlic powder, onion powder, complete seasoning, oregano, garlic & herb seasoning, salt, and pepper.
Mix until just combined, then form into evenly sized meatballs.
Place the meatballs on a parchment-lined tray and freeze for 30-45 minutes. This helps them firm up and hold their shape while cooking.
Heat a little oil in a large skillet over medium heat. Sear the meatballs on all sides until golden brown and cooked through. Remove and set aside.
In the same skillet, melt the butter. Add the minced shallot and saute for 1-2 minutes, then add the garlic and cook until fragrant.
Pour in the heavy cream and season with oregano, garlic powder, red chili flakes, salt, and pepper. Stir and bring to a gentle simmer.
Add the Parmesan and stir until melted and the sauce is creamy and smooth.
Add the spinach and cook until wilted.
Return the chicken meatballs to the skillet and coat them in the creamy garlic Parmesan sauce.
Let everything simmer together for a few minutes, then finish with fresh parsley and extra Parmesan. Serve with mashed potatoes or pasta.