Slow Cooker Sausages with Onion Gravy

These Slow Cooker Sausages with Onion Gravy are rich, hearty, and packed with old-fashioned comfort-food flavor. Juicy sausages cook slowly with plenty of sliced onions in a deep, savory brown gravy until everything is tender and full of flavor.

This is the kind of easy crockpot dinner that works perfectly on busy weekdays. Serve the sausages and caramelized onions over creamy mashed potatoes, buttered noodles, rice, or alongside crusty bread to soak up every drop of the gravy.

Why You Will Love This Recipe

The slow cooker does most of the work, while a quick browning step gives the sausages better color and flavor. The onions soften during cooking and become sweet and tender, creating a rich base for the gravy.

The recipe also uses simple ingredients and can easily be adjusted depending on the type of sausage you have available.

Ingredients

8 thick pork or beef sausages
3 large yellow onions, thinly sliced
2 tablespoons olive oil
2 tablespoons butter
3 cloves garlic, minced
2 cups low-sodium beef broth
2 tablespoons Worcestershire sauce
1 tablespoon Dijon mustard
1 teaspoon dried thyme
1/2 teaspoon smoked paprika
1/2 teaspoon freshly cracked black pepper
Salt, to taste
2 tablespoons cornstarch
2 tablespoons cold water
Fresh parsley for garnish, optional

Ingredient Notes

Sausages: Thick pork sausages work especially well, but beef, chicken, or turkey sausages can also be used. Choose a savory variety without an overly sweet glaze.

Onions: Yellow onions become beautifully soft and naturally sweet during slow cooking. Three large onions may seem like a lot at first, but they cook down considerably.

Beef broth: Beef broth creates a darker, richer gravy. Chicken broth can be substituted for a lighter flavor.

Worcestershire sauce: This gives the gravy extra savory depth and works especially well with browned sausages and onions.

How to Make Slow Cooker Sausages with Onion Gravy

Heat the olive oil in a large skillet over medium-high heat.
Add the sausages and brown them for about two to three minutes per side.
The sausages do not need to be fully cooked at this stage.
Transfer the browned sausages to the slow cooker.
Reduce the skillet heat to medium.
Add the butter and sliced onions.
Cook for about eight to 10 minutes, stirring frequently, until the onions begin to soften and turn golden.
Add the minced garlic and cook for another 30 seconds.
Transfer the onions and garlic to the slow cooker, spreading them around and over the sausages.
In a bowl, whisk together the beef broth, Worcestershire sauce, Dijon mustard, thyme, paprika, and black pepper.
Pour the mixture into the slow cooker.
Cover and cook on low for five to six hours or on high for approximately two and a half to three and a half hours.
Make sure the sausages are fully cooked before serving. Pork and beef sausages should reach at least 160°F, while poultry sausages should reach 165°F.
Transfer the sausages temporarily to a clean plate.
Mix the cornstarch with the cold water until smooth.
Stir the slurry into the hot onion gravy.
Cover and cook on high for another 10 to 15 minutes, until thickened.
Return the sausages to the slow cooker and spoon the onions and gravy over the top.
Garnish with parsley and serve hot.

Why Browning the Sausages First Is Worth It

You can technically put sausages directly into the slow cooker, but browning them first creates a much better result.

The skillet gives the outside a deep golden color and adds roasted flavor that slow cooking alone cannot create.

It also leaves flavorful browned bits in the skillet that help season the onions before everything goes into the crockpot.

How to Get Soft, Caramelized Onions

Give the onions a short head start in the skillet. They do not need to become fully caramelized, but cooking them for about 10 minutes helps develop sweetness and prevents them from tasting raw.

During slow cooking, they become even softer and absorb the sausage juices and savory broth.

How to Make Thick Onion Gravy

Once the sausages are cooked, a simple cornstarch slurry turns the cooking liquid into a glossy gravy.

Always mix the cornstarch with cold water before adding it to hot liquid. This prevents lumps.

If you prefer a thinner gravy, use only one tablespoon of cornstarch.

If the sauce becomes too thick, stir in a splash of warm beef broth until it reaches your preferred consistency.

Easy Variations

For mushroom sausage gravy, add eight ounces of sliced mushrooms with the onions.

For a slightly sweeter onion gravy, add one teaspoon brown sugar while sautéing the onions.

For garlic herb sausages, add rosemary and extra thyme to the broth.

For spicy sausages and onions, use hot Italian sausage or add crushed red pepper flakes.

For an extra-rich gravy, stir in two tablespoons of heavy cream during the final few minutes.

What to Serve with Slow Cooker Sausages

Mashed potatoes are one of the best sides because they soak up the rich onion gravy.

You can also serve the sausages over egg noodles, white rice, creamy polenta, or roasted potatoes.

For vegetables, try green beans, peas, roasted carrots, broccoli, cabbage, or Brussels sprouts.

Crusty bread or dinner rolls are also excellent for soaking up the extra gravy.

Can You Add Potatoes to the Slow Cooker?

Yes. Add about one and a half pounds of halved baby potatoes underneath the sausages at the beginning of cooking.

The potatoes will absorb the savory gravy and turn this into an even more complete one-pot meal.

Carrots can also be added at the same time if desired.

Make-Ahead Tips

The sausages can be browned and the onions cooked one day ahead. Refrigerate them separately in airtight containers.

You can also whisk together the broth mixture ahead of time so everything is ready to add to the slow cooker in the morning.

Storage and Reheating

Store cooled leftovers in an airtight container in the refrigerator for up to three to four days.

Reheat gently in a covered skillet over medium-low heat or in the microwave until steaming hot.

If the gravy becomes too thick after refrigeration, add a splash of beef broth or water during reheating.

The cooked sausages and gravy can also be frozen for up to two months. Thaw overnight in the refrigerator before reheating.

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