Turn on Instant Pot using saute function and allow liner to get hot. Add the oil and onions, and saute until onions soften. Turn off the Instant Pot.
1 tablespoon cooking oil, 1 white onion
Add the sauerkraut, beer, and bratwurst. Close the lid and set the valve to sealing. Use the manual (pressure cook) button to adjust the time to 15 minutes. After the time is up, allow a 10 minute natural pressure release before opening the valve to release any remaining pressure.
16 ounces beer, 28 ounces sauerkraut, 1 to 1 ½ pounds bratwurst
Carefully remove the lid. The brats may have sunk into the sauerkraut, so use tongs to transfer them to buns. Load the buns with the brats, sauerkraut, and your favorite condiments. Store leftovers in your fridge, in a sealed container, for up to 3-days.
5 hot dog buns
Notes
The calories listed are an approximation based on the ingredients and a serving size of 1 bratwurst, in a bun, topped with 1/4-cup of sauerkraut and onions. Actual calories will vary. Bratwurst leftovers can be stored in your fridge for up to 3-days in a sealed container.