This easy Slow Cooker Potato and Onion Bake features tender sliced potatoes, caramelized onions, creamy sauce, and melted cheese. A comforting, budget-friendly side dish perfect for family dinners.
Ingredients
- 2½ pounds (1.1 kg) potatoes, peeled and thinly sliced
- 2 large onions, thinly sliced
- 3 tablespoons butter
- 2 cloves garlic, minced
- 1 cup heavy cream
- ½ cup chicken or vegetable broth
- 1 teaspoon dried thyme
- ½ teaspoon garlic powder
- ½ teaspoon black pepper
- ½ teaspoon salt, or to taste
- 1½ cups shredded cheddar cheese
- ½ cup grated Parmesan cheese
- 2 tablespoons fresh parsley, chopped
Instructions
1. Prepare the Potatoes and Onions
Wash and peel the potatoes, then slice them thinly and evenly. Thin slices cook more consistently in the slow cooker.
Slice the onions into thin rings or half-moons.
2. Make the Creamy Sauce
Melt the butter in a small saucepan over low heat. Add the minced garlic and cook for about 30 seconds.
Stir in the heavy cream, broth, thyme, garlic powder, black pepper, and salt. Warm gently for 2–3 minutes. Don’t bring it to a full boil.
3. Layer the Ingredients
Lightly grease the inside of your slow cooker.
Arrange a layer of potatoes across the bottom, followed by some sliced onions. Sprinkle with a little cheddar and Parmesan.
Repeat the layers until all the potatoes, onions, and cheese have been used.
4. Add the Sauce
Pour the warm cream mixture evenly over the potatoes and onions. Gently press the potatoes down so the sauce can reach between the layers.
5. Slow Cook
Cover and cook on LOW for 5–7 hours, or until the potatoes are completely tender when pierced with a fork.
Cooking times vary depending on the thickness of the potato slices and your slow cooker.
6. Add the Final Cheese
About 20–30 minutes before serving, sprinkle the remaining cheese over the top if you have reserved any.
Cover again and allow the cheese to melt.
For a more golden, browned top, transfer the finished bake to an oven-safe dish and place it under the broiler for a few minutes, watching carefully.
7. Garnish and Serve
Let the potato bake rest for 10 minutes before serving. Sprinkle with fresh parsley and serve warm.
Tips for the Best Potato and Onion Bake
- Slice the potatoes evenly so they finish cooking at the same time.
- Yukon Gold or similar waxy potatoes work especially well because they hold their shape while becoming tender.
- Don’t use excessive liquid—the potatoes release moisture as they cook.
- For extra flavor, add cooked bacon or diced ham between the layers.
- A mixture of cheddar and Parmesan gives the dish both creaminess and a delicious savory crust.
- Avoid lifting the lid frequently because it releases heat and increases cooking time.
What to Serve With It
This comforting potato bake goes beautifully with:
- Roast chicken
- Grilled steak
- Pork chops
- Baked ham
- Meatloaf
- Roasted vegetables
- A fresh green salad
Storage
Store leftovers in an airtight container in the refrigerator for 3–4 days. Reheat gently in the oven or microwave until heated through.
This Slow Cooker Potato and Onion Bake is creamy, cheesy, hearty, and incredibly easy to prepare—a perfect side dish for a cozy family meal.