To a large pot, on medium-high heat, add the bacon and cook until crispy. Transfer to a paper towel lined plate and set aside. Discard half of the bacon grease from the pot.
On medium heat, sauté the onions, carrots and celery for 3-4 minutes. Stir i the garlic for 30 seconds. Next, add in the ground beef and break up the meat with a wooden spoon until no longer pink. Sprinkle in the flour and stir to coat for 1 minute. Add in the tomato paste and mustard and stir to coat. Sprinkle on the seasonings and salt and pepper to taste and stir to coat again. Slowly add in the broth while you stir Bring to a boil, then lower to the heat to a simmer and cover the pot and cook for 15 minutes. Toss in the gnocchi and cook until the gnocchi rises to the top of the soup.
Remove the pot from the burner and mix in the shredded cheddar, heavy cream, and sour cream. To serve, top with more shredded cheese, the reserved bacon, pickles and sesame seeds.