Cook 1 pound rotini noodles per the directions on the back of the box. Drain well and rinse with cold water to stop the cooking process. Make sure it drains very well after rinsing.
A pot of rotini pasta.
In a large bowl, whisk together 1 3/4 cups mayonnaise, 1/4 cup buttermilk, 2 Tablespoons dried ranch seasoning, 1/2 teaspoon garlic salt and 1/2 teaspoon black pepper.
A glass bowl of pasta salad sauce.
In a large bowl, stir together the cooked pasta, 10 ounces frozen peas and 8 ounces ham, small diced.
A bowl of rotini, ham, and peas.
Add the dressing and stir until everything is coated in the dressing. Cover and place in the fridge for 1 hour so the flavors can mingle.
A bowl of rotini pasta, ham, peas, and mayo based dressing.
Give it a good stir before serving.