These easy oven baked brats are roasted with sweet onions until juicy, golden, and full of flavor. It's a simple, hands-off dinner that's perfect for busy weeknights or anytime grilling isn't an option.
Toss onions in brown sugar, olive oil salt, pepper, and vinegar in a large bowl (or right in the cast iron skillet) until well coated.
Spread into an even layer in a large cast iron skillet.
Top with sausages and transfer to preheated oven.
Roast for 15 minutes, then toss onions and flip sausages, and roast for another 15-25 minutes, until onions are slightly caramelized, and sausages are cooked through and reach an internal temperature of 165 degrees f with a meat thermometer inserted in the center of a bratwurst. Cooking time can vary a bit depending on your oven and the size of the brats, so be sure to check their temperature prior to serving.
Allow Brats to rest for 5 minutes before serving to allow their juices to redistribute.
Notes
Store any leftover brats in an airtight container in the refrigerator for up to 5 days.