In a medium skillet over medium-low heat, warm the olive oil. Add onion, thyme and salt and pepper. Sauté until translucent, about 7 minutes. Add tomato paste and sauté for 1 minute. Remove the skillet from heat. Add chicken broth and worcestershire sauce. Set aside to cool for at least 15 minutes.
1½ cups onion, ½ teaspoon fresh thyme, ½ tablespoon olive oil, 1 teaspoon kosher salt, ½ teaspoon ground black pepper, ½ tablespoon tomato paste, 2 tablespoons plus 2 teaspoons chicken broth, 1½ tablespoons worcestershire sauce
Preheat the oven to 350˚F (180˚C).
In a large bowl, add both ground beef and break them apart into smaller chunks with your fingers. Toss gently to mix the beef. Add egg and bread crumbs. Mix everything gently with a fork, and be careful not to smash down.
½ pound ground beef, ½ pound ground beef, 1 large egg, ¼ cup plain bread crumbs
Transfer the meat mixture onto a rimmed baking sheet and form gently into a meatloaf (about 2-inch tall and 8-inch long) with your hands. Press slightly until the meatloaf just come together. Do not press too hard. Spread the ketchup evenly over top and sides.
¼ cup ketchup
Bake in the oven until cooked through, about 50 - 55 minutes. The internal temperature should be around 155 -160˚F. Remove from oven. Cut into 1-inch slices and serve immediately.
