Slow Cooker Sausage and Onions
This is pure set-it-and-forget-it comfort — plump sausages slow-cooked until juicy and browned, nestled in a pile of silky caramelized onions that melt into a rich, savory sauce. The onions cook down into something almost jammy, and that dark, glossy sauce is begging to be spooned over everything.
High in protein, low in carbs, and almost entirely hands-off — this is the kind of weeknight hero that tastes like you worked all day.
Why You'll Love This
Dump everything in the slow cooker and walk away
~22g protein per serving, only ~6g net carbs
Onions cook down into a naturally sweet, savory sauce
Perfect for game day, busy weeknights, or feeding a crowd
Amazing Protein Recipes
Slow Cooker Sausage and Onions
- Prep15 min
- Cook4 hrs
- Total4 hrs 15 min
- Servings6 servings
- skillet
- slow cooker
- whisk
- knife
- cutting board
- mixing bowl
- spoon
Ingredients
- For the sausages
- For the onions
Instructions
- Heat olive oil in a skillet over medium-high. Brown the sausages 2–3 minutes per side — just for color, they don't need to cook through.
- Layer the sliced onions in the bottom of the slow cooker and scatter the garlic over them.
- Whisk the tomato paste, beef broth, Italian seasoning, salt, and pepper; pour over the onions.
- Nestle the browned sausages into the onions.
- Cover and cook on LOW 4 hours (or HIGH 2–2.5 hours), until the sausages are cooked through and the onions are meltingly soft.
- Taste the sauce and adjust seasoning. Serve the sausages topped with a generous spoonful of onions and sauce, finished with fresh parsley.
Notes & Tips
- Brown first, always: That quick sear adds deep flavor the slow cooker can't create on its own — don't skip it.
- Slice onions pole to pole: They hold their shape better and cook down silkier than cross-cut slices.
- Don't lift the lid: Every peek adds 15–20 minutes to the cook time. Trust the process.
- Deglaze the skillet: Pour a splash of broth into the hot skillet after browning and scrape up the browned bits into the cooker.
- Nutrition: Per serving (estimate): 480 calories, 38g fat.
- Fridge: Store airtight up to 4 days — the flavor gets even better overnight.
- Reheat: Warm gently on the stove or in the microwave; add a splash of broth if the sauce thickened.
- Freezer: Freeze up to 3 months; thaw overnight in the fridge.
Variations & serving ideas
- Different sausage: Bratwurst, kielbasa, or chicken sausage all work — adjust cook time for pre-cooked varieties (3 hours on low).
- Add peppers: Bell pepper strips tossed in with the onions add color and sweetness.
- Beer version: Swap half the broth for a dark lager for a classic beer-brat flavor.
- Spicy kick: Use hot Italian sausage and add a pinch of red pepper flakes.
- Over cauliflower mash, tucked into low-carb rolls, or straight from the bowl with the onion sauce.
- The Secret to Silky Slow-Cooker Onions
- The secret is giving the onions the bottom layer. Sitting directly under the sausages in all that rendered fat and broth, they slowly collapse into a jammy, deeply savory bed instead of just steaming on top. It's the difference between "sausages with onions" and a dish where every bite tastes like more.
Nutrition Facts
Per serving · makes 6 servings
| Nutrient | Amount per serving |
|---|---|
| Total carbohydrate | 6 g |
| Protein | 22 g |
Nutrition values are approximate and vary with brands and portion sizes.
Frequently asked questions
How long does it take to make Slow Cooker Sausage and Onions?
About 4 hours 15 minutes in total: 15 minutes of prep and 4 hours of cooking.
What ingredients do I need for Slow Cooker Sausage and Onions?
The key ingredients include yellow onions, garlic, tomato paste, italian sausages, italian seasoning and parsley. The recipe card lists every ingredient with exact amounts.
How should I store leftovers?
Fridge: Store airtight up to 4 days — the flavor gets even better overnight. Freezer: Freeze up to 3 months; thaw overnight in the fridge.
How many servings does this recipe make?
It makes 6 servings.
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