Everyone can do bratwurst from the pan, here is a variant that is different and also tastes very tasty.
Peel and dice the onions. Sauté in a little butter over medium heat until translucent, stir in the cream and mustard and reduce a little. If necessary, season with a little salt and pepper.
Cut the sausages lengthways, leave the ends intact and open the pockets. Fill with the onion mixture and place in a greased casserole dish or ovenproof pan.
Bake at 200 ° C for about 20-25 minutes. If you want, you can use the roast set to make a sauce (boil and thicken, season to taste). This goes well with mashed potatoes.