Start by making the dry mix,
mix together the rolled oats, cinnamon, baking powder, brown sugar and salt in a bowl.
Then in another bowl, mix together the milk and vanilla.
Then scoop 1/4 a cup of the oatmeal mix into a mason jar, then scoop 1/4 cup of the milk/vanilla into the same mason jar.
Continue until all of the oatmeal and milk has been used up.
Then sprinkle blueberries on each mason jar.
Cover the mason jars with aluminum foil.
Then prepare your Instant Pot or Pressure Cooker, pour 2 cups of water into the Instant Pot Bowl. The place your mason jars inside.
Add the lid, per the instructions, and make sure it's in the "sealing position" Set the manual LOW pressure for 12 minutes. When the time is up, do a natural release.
Let naturally release, and then remove them with an Instant Pot Mitt, as they are hot, and use or refrigerate.