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If using fresh sausage links, cook in an ovenproof skillet over medium heat, turning occasionally to brown all sides. Cook time for fresh sausage is usually 15-20 minutes. If using precooked sausage links, I still like to brown them in the skillet. Brown precooked sausage links in a skillet over medium heat for approximately 5 minutes, turning occasionally to evenly brown sides.
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Once sausage links are cooked or browned, remove links from skillet and set aside. When links have cooled, slice into rounds.
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Return skillet to burner, add 1 tbsp butter and heat skillet over medium heat.
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When butter melts, add cabbage and onion to the skillet. Season with salt, pepper, and red pepper flakes. Sauté for 5-8 minutes, until cabbage starts to get soft and onion is translucent. Then add garlic and let cook another 1-2 minutes.
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Preheat broiler or turn your oven to bake at as high of a temperature as it will go.
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Next, add sour cream and mustard to the skillet. Stir to combine.
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Then add the sliced sausage links back to the skillet and mix in with the cabbage and onion.
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Top the skillet with the shredded cheddar cheese.
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Place the skillet in the oven on the top rack to broil for about 5 minutes. You can leave the oven door cracked, but it might take a few more minutes to brown. Watch carefully so that it does not get burned.