Heat olive oil in a large skillet over medium heat. Add diced yellow onion and cook for 5–7 minutes until softened.
Add minced garlic to the skillet and cook for another minute until fragrant. Set aside to cool.
In a mixing bowl, combine seasoned breadcrumbs with whole milk and let sit for about 5 minutes.
Add the cooled onion and garlic mixture to the breadcrumb mixture. Mix in ground chicken, grated Parmesan, beaten egg, parsley, Italian seasoning, and salt.
Mix all ingredients gently until thoroughly combined, avoiding overworking the meat.
Preheat the oven to 375°F (190°C) and line a baking sheet with aluminum foil.
Shape the meatloaf mixture into a loaf and place on the prepared baking sheet.
Bake for 30 minutes.
Spread marinara sauce over the top and sides of the meatloaf.
Return to oven and bake for an additional 25–35 minutes or until the internal temperature reaches 165°F (74°C).
Remove from oven, tent with foil, and let rest for 10–15 minutes before slicing.
Serve garnished with Panko breadcrumbs and extra Parmesan if desired.
Notes
Notes
Store leftovers in an airtight container for 3–4 days in the refrigerator or freeze for up to 3 months. Reheat to an internal temperature of 165°F before serving.