Step 1: Preheat and Prepare
First things first, preheat your oven to 400°F (200°C). This high heat is essential for getting a beautiful brown color on the sausages and encouraging the flavors to meld quickly. Lightly grease a 9×13 inch casserole dish or a large, oven-safe skillet.

Step 2: Sauté the Aromatics
In a large skillet over medium heat, melt the butter or heat the olive oil. Add the thinly sliced yellow onion and cook, stirring occasionally, for 5-7 minutes, or until the onion has softened and become translucent. Add the minced garlic and caraway seeds, cooking for another minute until fragrant. This step builds the foundational layer of flavor for the entire dish.

Step 3: Sear the Sausages (Optional but Recommended)
If you are using uncooked sausages like bratwurst, it’s highly recommended to sear them first. Push the onions to the side of the skillet and add the sausages in a single layer. Cook for 2-3 minutes per side, just until they develop a nice golden-brown crust. This Maillard reaction creates a massive flavor boost. You don’t need to cook them all the way through, as they will finish cooking in the oven. If using pre-cooked sausage like kielbasa, you can skip this step or give them a quick sear for extra flavor.

Step 4: Combine the Ingredients
Turn off the heat. Add the well-drained sauerkraut, Dijon mustard, black pepper, and optional smoked paprika directly to the skillet with the onions and sausages. If the mixture seems a bit dry, pour in the 1/4 cup of chicken or beef broth. Stir everything together gently until the sauerkraut is evenly coated with the seasonings and mustard, and the sausages are nestled into the mixture.

Step 5: Transfer and Bake
Carefully transfer the entire mixture from the skillet into your prepared 9×13 inch casserole dish. Arrange the sausages on top so they are evenly spaced and partially submerged in the sauerkraut.

Step 6: Bake to Perfection
Place the casserole dish in the preheated oven. Bake, uncovered, for 25-35 minutes. You’ll know it’s ready when the sauerkraut is hot and bubbly around the edges and the sausages are fully cooked through and beautifully browned on top.

Step 7: Rest and Garnish
Remove the dish from the oven and let it rest for at least 5-10 minutes. This crucial step allows the juices to redistribute back into the sausages and the flavors to settle, making for a much tastier and less messy serving experience. Just before serving, sprinkle generously with fresh, chopped parsley for a pop of color and fresh flavor.