1. Season steak with salt and pepper. Set aside. 

2. Set Instant Pot to saute. Add olive oil and onion. Cook onion, stirring, 2-3 minutes or until it begins to soften. Turn off the pot. 

3. Add sliced mushrooms, diced tomatoes with juice, Worcestershire sauce, water and cube steak to your pot, nestling the cube steaks into the other ingredients.

4. Add the lid to your Instant Pot and set the pressure cook time to 20 minutes.

Note: it will take some time for the pressure cooker to come up to pressure before 20 minutes begins to count down. Note: if you get a Burn message, give it a few minutes. The steak and mushrooms will be giving up additional liquid.

5. When cooking time is completed, do a quick quick release on your vent. Set the Instant Pot to the Saute setting and remove the cube steaks. 

6. In a small bowl, combine cornstarch and 2 Tablespoons cold water. Add the mixture to the pot and whisk to combine. Cook, stirring constantly until the mixture begins to thicken into gravy, about 3-4 minutes. Add the cube steaks back into the pot and serve. 

Turn off your Instant Pot.