Cook the bacon: Place bacon in a cold skillet. Turn heat to medium and cook until crisp, about 8–10 minutes, flipping as needed.
Drain on paper towels and crumble. For an even lighter option, use turkey bacon and bake at 400°F (200°C) for 10–12 minutes.
Prepare the chicken: Use leftover or rotisserie chicken for speed. If cooking fresh, season chicken breasts with salt, pepper, and a little garlic powder, then sear in a skillet with 1 teaspoon olive oil, 5–7 minutes per side, until cooked through.
Rest and slice or shred.
Mix the dressing: In a bowl, whisk Greek yogurt, mayo, milk, lemon juice, garlic powder, onion powder, dill, parsley, salt, and pepper. Adjust thickness with more milk and seasoning to taste. It should be creamy but pourable.
Prep the veggies: Chop the lettuce, halve the tomatoes, slice the cucumber and onion, and dice the avocado.
Pat produce dry to prevent watery salad.
Assemble: In a large bowl, add lettuce, tomatoes, cucumber, onion, and parsley or chives. Top with chicken, bacon, avocado, and cheddar if using.
Dress and toss: Drizzle about half the dressing over the salad. Toss gently to coat.
Add more dressing as needed, then taste and adjust salt, pepper, or lemon.
Serve: Finish with a crack of black pepper and a sprinkle of herbs. Serve immediately.