Preheat your oven to 375°F (190°C). Lightly grease a 12‑cup muffin tin with cooking spray or a bit of oil.
In a large bowl, combine ground chicken, diced onion, minced garlic, breadcrumbs, egg, parsley, Parmesan, salt, and pepper. Use your hands (yes — it gets messy, but it’s best that way) and mix just until combined. Avoid overworking the mixture to keep the loaves tender.
Scoop about 3 tablespoons of the mixture per loaf — enough to fill one muffin cup — and press gently into the tin. If you like, sprinkle a little extra grated Parmesan on top of each. Bake for 22–25 minutes, or until the meatloaves are cooked through and golden brown on top.
While the meatloaves bake, heat olive oil in a small saucepan over medium heat. Add minced garlic and sauté for about 1 minute until fragrant. Stir in the flour and cook for another minute. Then slowly whisk in the heavy cream and continue stirring until the sauce thickens. Remove from heat, stir in the Parmesan cheese and parsley, and season with salt to taste.
Remove the meatloaves from the oven and let them rest in the tin for 5 minutes. Then, plate them and drizzle the warm cream sauce over each loaf. Garnish with extra parsley or grated Parmesan if you like.