Cook the Pasta: Bring a large pot of salted water to a boil and add the rotini pasta. Cook for 8–10 minutes until al dente, stirring occasionally. Drain in a colander and keep warm.

Cook the Bacon: In a skillet over medium heat, add the crispy bacon and sauté for 5–7 minutes until golden brown. Transfer to a paper towel-lined plate to drain excess grease.

Prepare the Dressing: In a medium bowl, whisk together mayonnaise, sour cream, and apple cider vinegar until smooth. Season with salt and pepper to taste.

Combine Ingredients: In a large mixing bowl, combine the warm pasta and the prepared dressing. Fold in the crispy bacon until evenly coated.

Add Fresh Veggies: Just before serving, stir in the chopped lettuce and diced tomatoes. Gently toss to combine.

Serve and Enjoy: Transfer the salad to your serving dish. Serve chilled or at room temperature, garnished with sliced green onions.