Slow Cooker Sausages with Onion Gravy
Prep Time: 20 minutes
Cook Time: 4–6 hours on LOW or 2–3 hours on HIGH, plus 20–30 minutes to thicken
Servings: 4
These slow cooker sausages with onion gravy combine browned sausages, tender sliced onions, and a rich brown gravy for a comforting family dinner. Serve them over creamy mashed potatoes to soak up the sauce, with peas or green beans on the side.
Inspired by your photo, this recipe recreates the browned sausages, golden onions, and dark gravy in an oval cooking dish. The sausage type cannot be identified from the picture, so this version uses beef sausages.
A quick spell in a frying pan gives the sausages their browned exterior before they go into the slow cooker. The onions soften in the same pan, picking up the flavorful browned bits. Once everything is assembled, the slow cooker does most of the remaining work.
Ingredients for Slow Cooker Sausages with Onion Gravy
8 fresh beef sausages, approximately 1½ pounds total
1 tablespoon olive oil
3 large yellow onions, thinly sliced
2 garlic cloves, minced
2 cups low-sodium beef broth
1 tablespoon Worcestershire sauce
1 teaspoon Dijon mustard
½ teaspoon dried thyme
¼ teaspoon ground black pepper
2 tablespoons cornstarch
3 tablespoons cold water
1 tablespoon chopped fresh parsley, for garnish
Salt: Add only after tasting the finished gravy.
Ingredient Notes
Beef sausages: Choose sturdy, fresh sausage links with a flavor you enjoy. Their seasoning will influence the gravy, so plain or lightly seasoned sausages work particularly well.
Yellow onions: These soften and develop sweetness during cooking. Slice them evenly, approximately ¼ inch thick, so they cook at a similar rate and remain visible in the finished dish.
Beef broth: Low-sodium broth helps prevent an overly salty gravy, especially because sausages and Worcestershire sauce already contribute salt.
Worcestershire sauce: Adds savory depth. If needed, choose a version suitable for your dietary requirements.
Cornstarch: Thickens the cooking liquid into gravy near the end. Mixing it with cold water first prevents lumps.
Instructions
Step 1: Brown the Sausages
Heat the olive oil in a large frying pan over medium heat. Add the sausages in a single layer, working in batches if necessary.
Cook for 6–8 minutes, turning regularly, until browned on several sides. They do not need to finish cooking in the pan because they will continue cooking in the slow cooker.
Transfer them directly to a plate while you prepare the onions. Avoid piercing the casings, which can allow juices to escape.
Step 2: Soften the Onions
Add the sliced onions to the same frying pan. If the sausages released a large amount of fat, drain most of it first, leaving approximately one tablespoon.
Cook over medium heat for 8–10 minutes, stirring frequently, until the onions soften and begin turning golden. They do not need to become fully caramelized, but a little color improves the gravy’s flavor.
Stir in the garlic and cook for another 30 seconds. If the pan starts catching, add a small splash of the measured broth and scrape gently.
Step 3: Assemble the Slow Cooker
Spread the softened onions across the bottom of a 4- to 6-quart slow cooker. Arrange the browned sausages on top, nesting them among the onions.
In a jug, combine the beef broth, Worcestershire sauce, Dijon mustard, dried thyme, and black pepper. Whisk briefly, then pour the mixture over the sausages.
The liquid does not need to cover every sausage completely. The covered slow cooker retains moisture, and the onions release additional liquid as they cook.
Step 4: Cook Until Tender
Cover and cook on LOW for 4–6 hours or HIGH for 2–3 hours, until the sausages are fully cooked and the onions are tender.
Cooking time varies with sausage thickness and the slow cooker. Start checking near the beginning of the suggested range to avoid overcooking.
Keep the lid closed during most of the cooking period. Repeatedly lifting it releases heat and can extend the cooking time.
Step 5: Thicken the Onion Gravy
Mix the cornstarch with the cold water in a small bowl until completely smooth.
Carefully lift the sausages onto a plate. Stir the cornstarch mixture into the hot cooking liquid, then return the sausages to the slow cooker.
Cover and cook on HIGH for another 20–30 minutes, until the gravy thickens. Stir gently once during this stage to distribute the thickener without breaking the sausages.
If your slow cooker does not get hot enough to thicken the gravy, transfer the liquid and onions to a saucepan. Bring to a gentle simmer and stir until thickened, then spoon over the sausages.
Step 6: Taste and Serve
Taste the gravy before adding salt. Adjust the pepper or add a small pinch of salt if needed.
Sprinkle with chopped parsley and serve the sausages with plenty of onions and gravy. For a presentation similar to the photo, spoon some onions over the center of the sausages just before serving.
Tips for the Best Results for Slow Cooker Sausages with Onion Gravy
Brown before slow cooking. The slow cooker will cook the sausages, but it will not create the browned exterior shown in your picture. The initial pan step adds both color and flavor.
Slice onions consistently. Very thin slices may almost disappear into the gravy. Slightly thicker slices hold their shape while becoming tender.
Use a moderate amount of liquid. Slow cookers lose little moisture. Adding extra broth at the start can produce diluted gravy.
Thicken at the end. Adding cornstarch after the main cooking period gives you better control over the final consistency.
Adjust gradually. If the gravy becomes too thick, stir in broth one tablespoon at a time. If it remains thin, simmer it briefly in a saucepan.
Handle the sausages gently. Tongs make it easier to move them without splitting the casings.
Recipe Notes and Variations for Slow Cooker Sausages with Onion Gravy
For mushroom onion gravy, add 8 ounces of sliced mushrooms after softening the onions. Cook them briefly in the frying pan before transferring everything to the slow cooker.
For a slightly sweeter flavor, replace one yellow onion with a red onion. Avoid adding sugar immediately; taste the finished gravy first because slow-cooked onions already provide sweetness.
Chicken or turkey sausages can also work, although their cooking time and flavor may differ. Choose sausages that hold their shape during slow cooking and follow any relevant package guidance.
For a simpler seasoning profile, leave out the thyme. The onions, broth, and sausages still provide a satisfying base.
Storage and Reheating for Slow Cooker Sausages with Onion Gravy
Transfer leftovers to shallow, covered containers and refrigerate promptly. Store the sausages and gravy together for up to three days.
Reheat in a saucepan over gentle heat, turning the sausages occasionally and stirring the gravy. Add a splash of water or broth if the sauce has thickened in the refrigerator.
You can also freeze cooled portions for up to two months. Thaw in the refrigerator before reheating. The gravy may change texture slightly after freezing; gentle stirring and a little added broth usually help restore its consistency.
For advance preparation, slice the onions and mix the broth ingredients the evening before. Refrigerate them separately, then brown the sausages and assemble the dish when ready to cook.
Serving Ideas for Slow Cooker Sausages with Onion Gravy
Mashed potatoes: The classic choice for catching every spoonful of onion gravy. Spread the potatoes on the plate and place the sausages over them.
Steamed vegetables: Peas, carrots, broccoli, or green beans add color and balance the rich sauce.
Rice: Plain steamed rice makes an easy alternative to potatoes and absorbs the gravy well.
Crusty bread: Serve alongside smaller portions for dipping into the sauce.
Roasted potatoes: Their crisp edges provide a pleasant contrast to the soft onions and tender sausages.
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Frequently Asked Questions for Slow Cooker Sausages with Onion Gravy
Can I skip browning the sausages?
Yes, but the finished sausages will have a paler exterior and the gravy will have less depth. Browning is recommended for results closer to the picture.
Why is my gravy thin?
Onions and sausages release moisture during cooking. Add the cornstarch slurry at the end and allow enough heat and time for it to thicken.
Can I use ready-made gravy?
Yes, but it changes the seasoning and thickness. Replace the broth mixture with an equivalent amount of prepared gravy, then assess whether additional thickening is needed.
Can I double the recipe?
Use a larger slow cooker and stay within its recommended capacity. Cooking time may increase, so check the sausages rather than relying only on the clock.
Can I use frozen sausages?
Thaw them in the refrigerator before browning and slow cooking.
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