In your mixing bowl, start by adding the 1/2 cup of mayonnaise and 1/3 cup of white vinegar. The mayonnaise provides the creamy base, while the vinegar adds that essential tanginess.
Next, pour in the 2 tablespoons of light corn syrup. This ingredient adds a subtle sweetness that balances out the acidity of the vinegar.
Add 1 teaspoon of vegetable oil to the bowl. This helps to create a smoother texture in your dressing.
Sprinkle in 2 tablespoons of grated Parmesan cheese and 2 tablespoons of grated Romano cheese. These cheeses impart that rich, savory depth that you love in the Olive Garden dressing.
Add 1/4 teaspoon of garlic salt (or 1 minced garlic clove) along with 1/2 teaspoon of dried Italian seasoning and 1/2 teaspoon of dried parsley flakes.
Finally, squeeze in 1 tablespoon of lemon juice. This brightens the dressing and enhances all the other flavors.
Using your whisk or fork, mix all the ingredients together until you have a smooth and creamy dressing. Taste and adjust the seasoning if necessary.
Transfer your Copycat Olive Garden Salad Dressing into your storage container and refrigerate for at least 30 minutes before serving.