Brown the beef: Heat a skillet over medium-high.
Add the ground beef, season with salt, pepper, garlic powder, and smoked paprika. Cook until browned, breaking it up as it cooks. Drain excess fat if needed, but leave a little for flavor.
Make the sauce: In a small bowl, whisk mayonnaise, sugar-free ketchup, dill pickle relish, mustard, vinegar, onion powder, garlic powder, a pinch of sweetener, and a touch of smoked paprika.
Adjust salt and pepper. The sauce should be tangy, slightly sweet, and creamy.
Prep the veggies: Shred the lettuce. Dice the onions and tomatoes.
Slice or chop the pickles. Cube or shred the cheese.
Warm the beef with cheese (optional): If you like, sprinkle cheese over the hot beef in the pan and let it melt slightly for a gooey effect.
Assemble the bowls: Start with a generous bed of lettuce. Add a scoop of beef, a handful of cheese, pickles, onions, and tomatoes if using.
Drizzle with the special sauce.
Finish and serve: Sprinkle sesame seeds and add avocado slices if you want extra richness. Serve immediately while the beef is warm.