Step 1

Cook the Pasta: Add macaroni, water, and butter to the Instant Pot. Seal the lid and set to [Pressure Cook] (or Manual) on high for 4 minutes. When done, quick release the pressure.

Step 2

Add the Cheese: Open the lid. Stir in ½ cup of milk, then gradually mix in cheddar and Gruyère, 1 cup at a time, stirring between each addition. Add more milk until it reaches your desired level of creaminess. Season with salt and pepper to taste.

Step 3

Assemble and Broil: Transfer the mac and cheese to a 9x13-inch oven-safe baking dish.

Step 4

Make the Topping: In a bowl, mix panko, melted butter, cheddar, and Parmesan. Spread evenly over the mac and cheese.

Step 5

Finish Under the Broiler: Broil for 4–5 minutes, or until golden and bubbly. Watch closely!

Step 6

Serve Warm: Best enjoyed fresh out of the oven!