Prepare the Ingredients: Wash and halve the baby potatoes, then chop the bell peppers and onion into bite-sized pieces. Mince the garlic and place everything in separate prep bowls. Keeping the vegetables relatively uniform in size helps ensure even cooking throughout the foil packets.
Season the Vegetables: Add the potatoes, peppers, onions, and garlic to a large mixing bowl. Drizzle with olive oil, then season with salt, black pepper, smoked paprika, garlic powder, and onion powder. Toss thoroughly until every piece is evenly coated with oil and seasoning.
Prepare the Foil: Cut four large sheets of heavy-duty aluminum foil. Each sheet should be large enough to fully wrap and seal a complete serving while leaving a little room for steam circulation inside the packet.
Build the Packets: Divide the seasoned vegetable mixture evenly among the foil sheets. Place one or two bratwurst sausages on top of each pile of vegetables. Arrange the ingredients in a relatively even layer to promote consistent cooking.
Seal the Foil Packs: Fold the foil tightly around the ingredients and crimp the edges securely to create sealed packets. Proper sealing is important because it traps steam, juices, and flavor while helping the potatoes become tender.
Preheat the Grill: Heat your grill to medium-high heat, approximately 400°F (204°C). Clean the grates thoroughly and lightly oil them to prevent sticking and promote even heat distribution.
Grill the Foil Packs: Place the packets directly on the grill grates and close the lid. Cook for 20 to 25 minutes, allowing the ingredients to steam and roast inside the foil while absorbing the flavorful juices from the bratwurst.
Turn Halfway Through: Carefully flip the packets after about 10 to 12 minutes. Rotating them halfway through cooking helps ensure even heat exposure and more consistent results.
Check for Doneness: Carefully open one packet, being mindful of the hot steam. The potatoes should be fork-tender, the vegetables soft but not mushy, and the bratwurst fully cooked to a safe internal temperature. If needed, reseal the packet and continue cooking for a few additional minutes.
Rest Briefly Before Serving: Remove the packets from the grill and let them rest for 2 to 3 minutes. This allows the juices to settle and helps prevent steam burns when opening the foil.
Garnish and Serve: Carefully open the packets and transfer the contents to plates or serve directly from the foil. Garnish with fresh parsley, green onions, or additional cracked black pepper if desired. As the foil opens, you'll be greeted with the incredible aroma of smoky bratwurst, seasoned potatoes, tender vegetables, and savory juices that make Grilled Bratwurst Sheet Pan Foil Packs such a memorable outdoor meal.