In a medium-sized skillet over medium-high heat, brown the beef along with the onions and garlic until there is no pink left in the meat. Season with salt and pepper to taste
In the pot of your slow cooker, whisk together the water, tomato paste, onion powder, garlic powder, ground mustard, oregano, Worcestershire sauce, salt, and pepper
Add the diced potatoes, sliced carrots, and frozen peas
Mix in the cooked ground beef and cook on low for 6 hours, or on high for 3