I start by browning the ground beef in a skillet over medium heat until it's no longer pink. I make sure to drain off the excess grease before it goes into the crock pot, since nobody wants a greasy broth. This step only takes about 5-7 minutes.
Once the beef is ready, I add it straight into my 6-quart crock pot along with the diced onion, potatoes, frozen mixed vegetables, and all three cans of diced tomatoes with their juices. I don't drain the tomatoes because that liquid adds so much flavor to the broth.
Next, I pour in the beef broth and sprinkle in the Italian seasoning, salt, and pepper. I give everything a quick stir with a big spoon just to make sure the seasoning is evenly distributed through the pot.
I put the lid on and set my crock pot to low for 4-6 hours, or high for 2-3 hours if I'm short on time. I try not to lift the lid too often since it lets heat escape and slows down the cooking.
Once the potatoes are fork-tender, I taste the broth and adjust the salt and pepper if needed. Then I ladle it into bowls while it's piping hot and dig right in.