Heat a large skillet over medium-high heat. Add a drizzle of oil and the ground beef (or turkey). Cook, breaking up the meat, until fully browned, about 6–8 minutes.

Drain excess fat, then stir in taco seasoning and the amount of water called for on the packet (or 1/4 cup water if using homemade). Simmer 2–3 minutes until the flavors come together. Remove from heat and let cool slightly.

In a small bowl, whisk together sour cream, mayonnaise (or yogurt), salsa, lime juice, and cumin. Taste and season with salt and pepper. If you like it tangier, add another squeeze of lime.

Chop the lettuce and place it in a large serving bowl or on a platter. Add tomatoes, black beans, corn, red onion, and cheese. Toss gently to combine.

Scatter the warm seasoned meat over the salad. Add diced avocado if using. Pour about half of the dressing over the salad and toss gently — you can always serve the rest on the side for guests who want extra.

Just before serving, sprinkle the crushed Doritos over the top for that essential crunch. Garnish with cilantro and lime wedges.

Offer extra dressing and lime wedges at the table. For a fun twist, set out small taco bowls or bigger tortillas and let everyone scoop or build their own.