Step 1

Preheat the oven to 400ºF. In a small bowl stir together the olive oil, red wine vinegar, stone ground mustard, garlic powder, salt, and pepper. Set the vinaigrette aside.

Step 2

Slice the bell peppers and onion into 1/4-inch strips and place them on a large baking sheet. Add the bratwurst links to the baking sheet, then drizzle the vinaigrette over top. Toss the peppers, onions, and bratwurst until everything is coated in vinaigrette.

Step 3

Place the baking sheet in the oven and roast for 20 minutes, then give everything a good stir. Return the baking sheet to the oven and roast for another 20-25 minutes, or until the bratwurst, peppers, and onions, have browned on the edges.

Step 4

Stuff the bratwurst, peppers, and onions into the buns and top with shredded cheddar if desired. Place them back in the oven for about 5 minutes to melt the cheese and toast the buns. Top with more mustard just before serving.