In a deep skillet over medium-high heat or on high heat on the sauté feature of your air fryer/multi-cooker unit, bring the beer and brats to a boil. Simmer for 4 minutes. Please note: the brats will not be completely cooked through at this point; only parboiled. Carefully remove the brats from the beer without puncturing the brats.
In a medium-size mixing bowl, toss the onion with olive oil and salt until covered.
If using a multi-cooker, drain the beer from the cooking pot. Return the pot to the cooker. Add the air fryer basket to the pot and cover.
Preheat the air fryer to 390 degrees for 1 minute.
Add the onions to the air fryer basket. Layer the par-boiled brats on top. Air fry the onions and brats for 10-12 minutes, turning the brats and sausages halfway through the cooking time, or until the onions are tender and the brats are golden brown and cooked to an internal temperature of 160 degrees.
Serve the brats with the onions in hot dog buns with german mustard to serve. Enjoy hot!
Notes
Leftover brats keep covered in an airtight container in the refrigerator for 3-4 days. For best results:
Store the buns separately from the brats. Ideally in a freezer-safe bag in the freezer (this keeps the bread as fresh as possible). Thaw the buns at room temperature for 15-30 minutes before serving.
Reheat the brats in the air fryer at 375 degrees for 3-5 minutes, or until the brats are reheated through.
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