Select the SAUTE setting on Normal to preheat the Instant Pot.
Add 1 tablespoon olive oil to the pot and heat until shimmering.
Add the 2 lbs (900 g) chicken tenders to the pot and season both sides with ½ teaspoon salt, ¼ teaspoon ground black pepper, and ½ teaspoon dried oregano.
Brown the chicken tenders 1–2 minutes per side using the SAUTE function for better texture (this step is optional).
Remove the browned (or unbrowned) chicken tenders from the pot and set them aside on a plate.
Pour 1 cup (250 ml) water into the hot pot and use a spatula to scrape any browned bits from the bottom to deglaze the pot.
Place the trivet in the Instant Pot and arrange the chicken tenders on the trivet (or use a steamer basket if you prefer).
Secure the lid, set the steam release valve to SEALING, select PRESSURE COOK/MANUAL on High pressure, and set the cooking time to 3 minutes. (The Instant Pot will take about 5 minutes to come to pressure.)
When the cooking program ends, perform a Quick Release of the pressure (carefully move the valve to VENTING).
Open the lid, remove the chicken tenders, and serve.