1 tablespoon olive oil
1 pound ground beef, 80% lean
1 medium yellow onion, diced
1 tablespoon tomato paste
2 teaspoons garlic powder
1 teaspoon onion powder
1 teaspoons sea salt, more to taste
1 teaspoon freshly ground black pepper
2 tablespoons all-purpose flour
1 tablespoon Worcestershire sauce
1 cup beef broth
1 (14.5 ounce) can diced tomatoes
8 ounces shredded cheddar cheese, divided
4 cups frozen tater tots, about 16 ounces
2 teaspoons finely chopped fresh parsley, for garnish
1/2 cup favorite mustard, for serving