Heat a large pot or Dutch oven over medium-high heat. Add the ground beef and chopped onion, breaking the beef apart with a spoon as it cooks until browned and the onion is softened, about 5-7 minutes. Drain excess fat from the pot by tilting it slightly and using a spoon to push the meat to the side, then carefully pour off the liquid. I like to leave just a thin coating of fat in the bottom—it carries so much flavor and helps the next ingredients develop a deeper taste.

Add the tomato paste to the pot with the cooked beef and onions, stirring constantly for about 1-2 minutes to cook it slightly and deepen its flavor. This prevents it from tasting raw and helps it blend smoothly into the broth. Pour in the beef broth, diced tomatoes with their juices, Worcestershire sauce, dried oregano, dried basil, garlic powder, and bay leaf. Stir well to combine all ingredients and dissolve the tomato paste completely.

Bring the soup to a boil over medium-high heat, then immediately reduce the heat to medium-low and simmer gently for 5 minutes. This allows the seasonings to fully infuse into the broth and develop a more cohesive flavor. Don't skip this step—those few minutes of gentle simmering make a real difference in the final taste.

Stir the macaroni and frozen mixed vegetables directly into the simmering soup. Return the soup to a gentle boil, then reduce heat to medium and simmer uncovered for 8-10 minutes, stirring occasionally, until the pasta is tender and the vegetables are heated through. The pasta will continue to absorb broth as it cooks, so the consistency will thicken slightly—this is perfect for a hearty soup.

Remove the bay leaf from the soup and taste it. Season generously with salt and pepper to your preference—remember that the broth is already seasoned, so you're just bringing out the flavors now. Ladle into bowls and serve hot.