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Slow Cooker Sausage Casserole is my go-to “I need something cozy, nutritious, and absolutely zero-stress” dinner. It’s a true dump-and-go meal loaded with sausage, quinoa, veggies, and creamy white beans. It’s basically all the things that make little bellies happy and keep parents sane on busy nights.
Why you’ll love this slow cooker sausage casserole
- Great for leftovers – reheats and freezes beautifully for busy nights.
- Dump-and-go friendly – 10 minutes of chopping, then the slow cooker takes over.
- High protein + fiber – sausage, quinoa, and white beans keep tummies fuller longer.
- Veggie-loaded – bell peppers, peas, and tomatoes built right in.
- Baby and toddler-friendly options – easy tweaks for softer textures and lower salt.
Hi! I’m Min, your pediatric dietitian mom friend, and I know you’re constantly looking for ways to make the meals my kids love just a little more nourishing without making extra work for myself.
Sausages are usually a bit hit with the kids, including mine, so I’m using that as my “in” and building around it. This slow cooker sausage casserole packs in colorful veggies, protein-rich quinoa for whole grain goodness, and creamy cannellini beans for extra fiber and staying power.
Everything cooks together so easily! Just dump, stir, and let the slow cooker do its thing. Just be prepared to be AMAZED!
For more slow cooking magic, check out my slow cooker sesame chicken, slow cooker BBQ chicken, and slow cooker chicken and mushrooms.
Table of Contents
Key Ingredients
I am highlighting just the ones that need further explanation. The complete list is in the recipe card below.
- Sausage – I love Aidell’s chicken sausage but feel free to use whatever you love. Chicken, turkey, or pork all work great. Choose mild or Italian-style depending on what your family enjoys.
- Quinoa – Adds a hearty texture and a boost of protein and fiber. It soaks up all the saucy goodness, making every bite extra tasty. If you’re cooking for little ones, check out this guide on how to cook quinoa for babies for tips on texture and serving ideas.
- Tomato Sauce + Paste – These team up to make a rich, cozy sauce that ties everything together. The paste adds depth while the sauce keeps things smooth and kid-friendly. This hidden veggie pasta sauce would work great!
- White Beans – Creamy and filling, they add extra protein and fiber for a satisfying meal that actually keeps everyone full.
- Frozen Peas – Toss them in at the end for a pop of color and a hint of sweetness.
Substitutions
Here are some easy swaps to make this slow cooker sausage casserole fit your family’s preferences or what you already have on hand:
- Sausage – Use chicken or turkey sausage for a lighter option, or swap in diced chicken thighs or ground beef if that’s what you’ve got. For a plant-based version, try a vegetarian sausage or crumbled tofu. Check out The Ultimate Guide to Tofu for Babies for tips on texture, cooking methods, and safe serving ideas.
- Quinoa – Brown rice, farro, or couscous all work great here. Just adjust the cooking time as needed since they cook differently in the slow cooker.
- Tomato sauce – Crushed tomatoes or marinara sauce can stand in, just add a bit more seasoning to taste.
- Bell peppers – Use zucchini, carrots, or spinach instead (or in addition!) to mix up the veggies.
- Frozen peas – Frozen corn or chopped green beans make an easy swap if that’s what’s in your freezer.
How To Make Slow Cooker Sausage Casserole
You’ll find the full recipe card with all the exact measurements at the bottom of this post.
Step 1: Lightly grease the insert of your slow cooker to prevent sticking. Add all the ingredients except the frozen peas directly into the slow cooker. Give everything a good stir to combine — no need to brown the sausage first! Cover and cook on low for 6–7 hours or high for 3–4 hours. In the last 10 minutes of cooking, stir in the frozen peas. They’ll cook through quickly and add a pop of color and sweetness.
Step 2: In the last 10 minutes of cooking, stir in the frozen peas. They’ll cook through quickly and add a pop of color and sweetness. Give it a good stir and garnish with chopped parsley or a sprinkle of cheese, and serve warm.
Expert Tips
- You’ll need a 5–6 quart slow cooker for this recipe
- Layer smartly. I like to add the quinoa on top of the sausage and veggies rather than at the very bottom. It still cooks perfectly but stays nice and fluffy. Less chance of turning mushy or sticking.
- Adjust the liquid if needed. If you like your casserole saucier, add an extra splash of broth or sauce halfway through cooking.
- Add frozen peas at the end. Stir them in during the last 10 minutes so they stay bright, fresh, and slightly crisp not mushy.
- Finish with a little something extra. Right before serving, sprinkle with fresh parsley or a bit of shredded mozzarella or parmesan. It adds that cozy finishing touch and makes it feel restaurant-worthy.
- Let it rest. After cooking, let the casserole sit (covered) for about 5–10 minutes before serving. This helps the quinoa absorb any extra liquid and makes scooping easier.
Variations
Here are a few easy ways to customize this slow cooker sausage casserole to fit your family’s taste (or whatever you have in the fridge!).
- Spicy twist – Use spicy Italian sausage or add a pinch of red pepper flakes for a little kick (great for adults, just portion some out for the kids first!).
- Cheesy casserole – Stir in shredded mozzarella, cheddar, or parmesan at the end for an extra creamy, melty finish.
- Mediterranean-style – Swap the tomato sauce for crushed tomatoes, add chopped spinach or olives, and finish with crumbled feta.
- Tex-Mex flair – Replace Italian seasoning with chili powder and cumin, use black beans instead of white, and top with avocado and cilantro before serving.
Serving Suggestions
Here are some serving suggestions that pair perfectly with this slow cooker sausage casserole:
- Simple side salad – A fresh green salad with a light vinaigrette balances the richness of the casserole.
- Crusty bread or garlic toast – Perfect for scooping up any extra sauce.
- Roasted or steamed veggies – Broccoli, green beans, or roasted Brussel sprouts and carrots, roasted sweet potatoes and carrots, or roasted parsnips add extra color and nutrients.
- Quick pickles – A little tangy crunch from pickled cucumbers or carrots brightens up the meal.
- Kid-friendly tweaks – Serve with a side of this homemade unsweetened applesauce, sliced fruit, or even a little plain yogurt for a creamy contrast.
Slow Cooker Sausage Casserole FAQs
No need to brown the sausage first! The slow cooker will cook it through perfectly.
Yes! Chop the veggies and slice the sausage the night before, then store everything in the fridge. When ready, just dump into the slow cooker and cook.
Yes! Just cook the quinoa a bit softer, chop the sausage into small pieces, and check the seasoning. You can also remove spicy or heavily salted sausages and sneak in extra beans and veggies.
Let the casserole cool completely, then transfer leftovers to an airtight container. It keeps well in the fridge for up to 4–5 days.
For longer storage, freeze in individual portions or a large container for up to 3 months.
Reheat in the microwave or on the stovetop until warmed through, adding a splash of broth if it looks a little thick.
More Slow Cooker Recipes
Looking for other recipes like this? Try these:
Did you make this recipe? Leave a rating below and let me know how you liked the recipe! Your feedback means so much to me!
Slow Cooker Sausage Casserole
Equipment
Ingredients
- 1 pound sausage, sliced
- 1 small onion, sliced
- 2 bell peppers, chopped
- 1 cup quinoa
- 2 tablespoons tomato paste
- 1 teaspoon Italian seasoning
- 1/2 teaspoon garlic powder
- 1/2 teaspoon smoked paprika (optional)
- 1 1/2 cups favorite tomato sauce
- 1 cup low-sodium broth (chicken, beef, or vegetable)
- 15 ounce white beans, rinsed and drained
- 1 cup frozen peas
Instructions
- Lightly grease the insert of your slow cooker to prevent sticking. Add all the ingredients except the frozen peas directly into the slow cooker. Give everything a good stir to combine — no need to brown the sausage first!
- Cover and cook on low for 6–7 hours or high for 3–4 hours. In the last 10 minutes of cooking, stir in the frozen peas. They’ll cook through quickly and add a pop of color and sweetness.
- Give it a good stir and garnish with chopped parsley or a sprinkle of cheese, and serve warm.
Notes
- Use a 5–6 quart slow cooker so everything cooks evenly.
- Layer smartly by adding the quinoa on top—keeps it fluffy and prevents sticking.
- Adjust liquid as needed with a splash of broth or sauce if you prefer it saucier.
- Add peas at the end so they stay bright and not mushy.
- Let it rest 5–10 minutes before serving to help the quinoa absorb extra liquid.
I made this today and it was absolutely delicious! Would’ve never thought about putting these ingredients together in a crockpot, but I’m so thankful Min did!
Haha that’s what I’m here for! SO glad you love this one as much as we do!
Does the quinoa need to be cooked first?
Nope! Add uncooked!
This one is so hearty and cozy, total comfort food! My kids absolutely love it, which makes it a repeat in our house 🙌