Instant Pot Mushroom Pork Roast with Mashed Potatoes {all in one pot!}

Mushroom pork roast and mashed potatoes cooked at the same time, in the same pot, yet separate by stacking your ingredients. 

This easy whole dinner, is ready with one pot! Gravy included.

A pork dinner, the mashed potatoes, AND the mushroom gravy all cooked at the same time, and in one pot seems to good to be true. 

I wouldn't lie to you, friends! 

Cooking multiple things within your Instant Pot at once is what quick dinner dreams are made of, but can definitely be a little bit more tricky that your typical "dump and go" Instant Pot recipes. 

Do I need extra accessories to cook multiple things at once?

For most of these kinds of recipes, yes you will need accessories. 

For this one, we stack the potatoes on top of the roast and we want the steam to hit the potatoes, so we use this stainless collapsible steamer basket, which sits right on top of the pork roast. 

What size Instant Pot do I need for this?

I use my 6 quart Instant Pot for this, but if you want to make a large portion of mashed potatoes, you will need an 8 quart Instant Pot to stack more potatoes in. 

The pressure time does not need to be adjusted if using the 8 quart model. 

This recipe will not fit in the 3 quart model. 

Are pork loin and pork tenderloin the same? Can I use either? 

NO! These are not the same and require significantly different cook times. 

Pork loin (roast) which is what is used for this recipe, has 20 minute pressure time, whereas pork tenderloin (which is used in my popular apple honey pork tenderloin recipe) is a 7 minute pressure time. 

If you use a pork tenderloin for this recipe, you will reduce the time to 7 minutes, and you will cut your potatoes into much smaller pieces so they cook in 7 minutes. 

How to prepare Instant Pot mushroom pork roast and mashed potatoes

This recipe has a few steps and the layering of items is important. 

First, you want to saute the aromatics. In this case the mushrooms and onion. Once they are caramelized and cooked, you add the broth. This is what goes on the very bottom of your pot. 

Next, you always want to longest cook time item on the bottom (closest to the heat source).

So in this case, the pork roast goes in the liner.

Because we want to keep the potatoes separate, we place the collapsible petal steamer basket on top of the roast and load it up with potatoes. 

You don't want to put whole potatoes in, as very large ones won't cook in the 20 minute cook time that the roast needs. Quartering russet potatoes works well here. 

Now, you simply secure the lid, set to sealing, and pressure cook on high for 20 minutes. 

When the pressure cycle is complete, you quick release the pressure, and lift the steamer basket out. 

Transfer the potatoes to a bowl, add the cream and butter, give them a mash, and BAM! mashed potatoes. 

While the pork is resting (covered), go back to saute function, add your slurry, and thicken the gravy. 

When the gravy is done, the pork roast should be ready to be sliced - and gravy poured over! 

So, there you have it.

A whole meal, layered strategically, to cook all at once - yet separately, in your Instant Pot! 

Are you ready to make Instant Pot Mushroom Pork Roast with mashed potatoes, and gravy.... ALL IN ONE POT?!