In a large mixing bowl, combine ground chicken, ricotta, 1/4 cup parmesan, breadcrumbs, egg, half of the minced garlic, oregano, salt, and pepper.
Form the mixture into approximately 16 evenly sized meatballs, about 1.5 inches in diameter.
Heat olive oil in a large skillet over medium-high heat and brown the meatballs on all sides for 8-10 minutes until cooked through. Remove meatballs from skillet and set aside.
In the same skillet over medium heat, melt the butter and add the remaining minced garlic, cooking for 1 minute until fragrant.
Pour in the heavy cream and bring to a gentle simmer.
Whisk in 1 cup of parmesan cheese and nutmeg, stirring constantly until the sauce thickens.
Add the baby spinach to the sauce and stir until wilted.
Return the meatballs to the skillet and toss to coat in the sauce. Simmer for an additional 2-3 minutes before serving.