Preheat oven to 400 degrees F.
Line a baking sheet with parchment paper or aluminum foil (for easier clean up) and place the brats so they are not touching.
4 brats of your choice
Bake for 10 minutes, turn, and bake for another 7 minutes.
Use a meat thermometer and make sure they reach an internal temperature of 160°F in the middle.
In the meantime, heat butter in a skillet until it slightly bubbles but doesn’t brown (medium-low heat).
2 tablespoons butter
Add sliced onions and cook for about 3 minutes until they become slightly caramelized.
½ yellow onion, sliced
Then, add the sliced peppers and cook everything for an additional 10 minutes, stirring occasionally. You want the veggies to be al dente, still slightly firm.
½ red bell pepper, sliced, ½ green bell pepper, sliced
Season with salt, pepper, and caraway seeds (if used), and taste.
½ teaspoon kosher salt, ½ teaspoon freshly cracked black pepper, ½ teaspoon caraway seed (optional)
Place brat on sandwich roll, smother with the onions and bell peppers, and finish off with a generous dollop of stone ground mustard,
2 tablespoons stone ground mustard, 4 sandwich buns
Serve with a side of sauerkraut, potato salad, or cole slaw and - if you like beer - an ice cold glass of German lager or pilsner.