Preheat your oven to 350°F (175°C). Line a rimmed baking sheet with parchment paper or lightly grease it to prevent sticking.
Sauté the onions: Heat 1 tablespoon of olive oil in a skillet over medium heat. Add finely chopped yellow onions and cook for 5–7 minutes, stirring often, until they’re soft and translucent but not browned. Let them cool slightly before adding to the meat mixture.
Mix the wet ingredients: In a small bowl, whisk together 1/2 cup of chicken stock, 1/2 cup ketchup, 1 tablespoon Worcestershire sauce, and 2 eggs until well combined. This will keep your meatloaf extra moist and flavorful.
Combine the meat mixture: In a large mixing bowl, add the ground chuck, optional ground pork, sautéed onions, fresh chopped parsley, chopped thyme, plain breadcrumbs, and salt and pepper to taste. Pour in the wet mixture and gently mix everything together with your hands or a fork. Avoid over-mixing—this is key to keeping the meatloaf tender, not dense.
Shape the loaf: Transfer the mixture onto your prepared baking sheet. Using your hands, gently form it into a loaf shape—about 9 inches long by 4–5 inches wide. Smooth the top with your hands or a spatula.
Apply the glaze: Brush the top and sides of the loaf with extra ketchup or your favorite meatloaf glaze. This adds a sticky, tangy finish that caramelizes beautifully in the oven.
Bake for 1 hour and 15 minutes, or until the internal temperature reaches 160°F (71°C) on a meat thermometer.
Let it rest: Remove the meatloaf from the oven and let it sit for at least 10 minutes before slicing. This step helps the juices redistribute and makes cleaner slices.
Serve warm, with your favorite sides—mashed potatoes, green beans, or even in a sandwich the next day!