Step 1

Cook the rotini pasta in a large pot of salted boiling water. Cook according to the package directions until al dente. Drain and rinse under cold water until the pasta is completely cooled. Drain well.

Step 2

In a large bowl, whisk together the mayo, buttermilk, ranch dressing mix, garlic salt, and black pepper until smooth and well combined.

Step 3

Add the cooled pasta, diced ham, frozen peas, and diced green pepper (if using) to the bowl with the dressing. Toss until everything is evenly coated.

Step 4

Cover and refrigerate the pasta salad for at least 2 hours, or overnight. This will allow the flavors to meld together. The pasta will absorb some of the dressing as it chills.

Step 5

Give the pasta salad a good stir before serving. Taste and adjust seasonings if needed. Serve chilled or at room temperature. Enjoy!