To cook potatoes with an Instant Pot: Add 1 cup cold water to the inner pot of the pressure cooker. Place a steamer basket on top of the water, then add the potatoes on top. Seal and secure the lid, cook on high pressure for 15 minutes, then carefully do a "quick release" of the pressure. Once the pressure has fully released, open the lid and transfer the potatoes to a large bowl.

To cook potatoes on the stovetop: Place potatoes in a large saucepan or Dutch oven and cover with cold water by a few inches. Add 1 teaspoon of kosher salt and bring to a boil over high heat. Once boiling, reduce the heat to maintain a gentle boil. Cook until the potatoes are tender when pierced with a knife or fork, about 10-15 minutes. Drain potatoes and transfer to a large bowl.

Smash potatoes with a potato masher or large fork (I actually like using a meat chopper for this job!).

Add dill, oregano, chives, parsley, green onions, mayonnaise, mustard, kosher salt, malt vinegar, and black pepper. Stir well to combine. Taste for seasoning and add more salt if needed. Cover and refrigerate until ready to serve.