• The beer and butter listed in the ingredients list are just for stovetop brats. Air frying or baking them just requires the sausages only or perhaps peppers and onions if you want to add them at the same time.

Stovetop

• In a deep skillet or Dutch oven, add the brats, 1 sliced onion, the beer, and ½ of a stick of butter cut into cubes. Make sure the beer is just covering the meat. 
• Bring the beer mix to a slow boil, turn the heat to medium-low, and simmer the bratwurst for 10 minutes.
• Remove the bratwurst from the liquid and clean out the pan, making sure to scoop out the savory onions to serve as a side.  Pan-fry them in a skillet with a little oil for 3 minutes on each side until brown. The internal temperature should be at least 160F to be properly cooked. 

Air Fryer

• Preheat the air fryer for 5 minutes at 360 F.
• Place the bratwurst in the air fryer basket, leaving space between the sausages.
• Air fry for 11-15 minutes or until browned to your liking, flipping halfway through cooking.

Baked

• Preheat the oven to 400 F.
• Lay the uncooked sausages on a baking sheet or in a cast-iron skillet, making sure to spread them out on the pan.
• Cook them for a total of 18-20 minutes, flipping after halfway through cooking or until the internal temp reaches 160 F.
• If you want the sausage a little more brown, just pop them under the broiler for 1-2 minutes.