Make the sauce. In a small bowl, whisk Greek yogurt, mayo, ketchup, mustard, pickle juice, garlic powder, onion powder, paprika, salt, and pepper. Adjust to taste.
Chill while you prep the rest.
Prep the veggies. Chop lettuce, dice tomato, and slice or chop pickles. If using avocado, slice it just before serving to keep it fresh.
Cook the base (optional). If you want rice or cauliflower rice, warm it. For cauliflower rice, sauté in a dry skillet with a pinch of salt until tender, about 4–5 minutes.
Sauté aromatics. Heat a large skillet over medium.
Add oil if your beef is very lean. Cook onion for 2–3 minutes until softened, then add garlic for 30 seconds.
Brown the beef. Add ground beef, breaking it up. Season with salt, pepper, paprika, and mustard powder.
Cook until browned and no longer pink, about 5–7 minutes. If using Dijon instead of mustard powder, stir in 1 tsp at the end. Taste and adjust seasoning.
Melt the cheese. Turn heat to low.
Sprinkle shredded cheddar over the hot beef and cover for 1–2 minutes to melt. Alternatively, keep cheese separate and add to bowls individually.
Assemble the bowls. Add lettuce to each bowl. Spoon in beef and cheese.
Add tomato, pickles, and avocado if using. Include a scoop of rice or cauliflower rice if you want extra volume.
Finish with sauce. Drizzle the burger sauce over the top. Add freshly cracked pepper and a pinch of salt to the tomatoes for extra flavor.
Serve. Enjoy warm.
If meal-prepping, keep lettuce and sauce separate until serving.