Preheat your oven to 325°F and line a sheet pan with parchment paper.
Heat olive oil in a skillet and sauté finely chopped onions, thyme, salt, and pepper for about 8-10 minutes until translucent.
Stir in Worcestershire sauce, chicken stock, and tomato paste, cooking for 2-3 minutes, then remove from heat and let cool.
In a bowl, combine ground chuck with the cooled onion mixture, bread crumbs, and beaten eggs; mix gently.
Shape the meat mixture into a loaf on the prepared sheet pan, and spread ketchup on top.
Bake in the preheated oven for 1 to 1 hour 15 minutes until the internal temperature reaches 160°F.
Let the meatloaf rest for at least 10 minutes before slicing to ensure moisture retention.
