In a medium bowl, mix together the flour, oats, brown sugar, nutmeg, cinnamon, and salt. Use a fork or pastry blender to combine until it resembles small crumbs. When you achieve that crumbly texture, add in the chilled butter pieces. Just keep mixing until everything is well combined. Once done, pop it in the fridge while you tackle the apple filling.

Grab another mixing bowl and combine the melted butter, lemon juice, vanilla extract, brown sugar, cinnamon, and a pinch of salt. Stir until everything is mixed well. Now, toss in those chopped Granny Smith apples and gently coat them in that sweet buttery mixture.

Spray the inside of your Instant Pot with a non-stick cooking spray to avoid any sticky situations later. Pour the apple mixture into your pot, then add the cup of water. It’s key to have that water for steaming!

Now, sprinkle the crumb topping evenly over the apples in the Instant Pot. It should cover them nicely, creating that iconic apple crisp layer we all know and love.

Cover your Instant Pot lid and set it to cook on high pressure (manual setting) for 1 minute. Yes, just a minute! When the timer beeps, carefully turn the valve for a quick release of the steam. Start slow to let out the steam before fully opening it.

If you want that nice, toasty finish on the topping, you can transfer individual servings into an oven-safe dish and pop it under a broiler for around 1-2 minutes. Just keep an eye on it to avoid burning.