• Cook potatoes in an instant pot
• Pour1 cup water into your instant pot. Place cubed potatoes on the trivet. Press pressure cook and set the cooking time for 3 minutes at high pressure
• Then turn the release valve from sealing to venting position and do a quick pressure release
• Open the lid, remove the cooked potatoes carefully. Mash potatoes with a fork. Add on some milk if need. Set aside

Sauté garlic and onions

• Press the sauté mood on. When it says hot, then add 2 tablespoons of oil or butter
• Put in crushed garlic and fry until fragrant. Add onions and cook until translucent. Cancel the sauté option of the instant pot
• Pour2 cups of cream of mushroom soup. You can also add water. Set cooking time for macaroni and corned beef
• Add macaroni, macaroni spices, canned corned beef slices. Close the lid of the instant pot
• Press pressure cook and set cooking time for 7 minutes. Then do a quick pressure release
• The Layering of mashed potatoes
• Make a layer of mashed potatoes on cooked mac and cheese, sprinkle some salt, pepper, and chopped parsley
• Add grated cheese of your choice. I used cheddar cheese. Spread generously. Close the lid
• The instant pot is hot enough to melt the cheese on top of the corned beef hash mac and cheese. Wait for 3 minutes