This slow cooker potato gratin is the kind of easy potluck dish that disappears fast, especially in summer when oven space is limited and everyone wants something rich, cozy, and crowd-pleasing beside burgers and grilled chicken. Thin-sliced Elba potatoes turn especially tender in the slow cooker, while bubbling cheese and cream create that classic gratin feel with barely any hands-on work, which is exactly why this one has become a repeat recipe in my busy household.
Serve this cheesy potato gratin alongside grilled bratwursts, barbecue chicken, burgers, ham, or steak, and add a crisp green salad, watermelon, corn on the cob, or baked beans to round out the plate. It also fits right in on a holiday buffet with pasta salad and fresh fruit, and leftovers pair surprisingly well with fried eggs for breakfast the next morning.
4-Ingredient Slow Cooker Summer Potluck Bubbling Cheese Potato Gratin using Thin-Sliced Elba Potatoes
Servings: 8
Ingredients
3 pounds Elba potatoes, thinly sliced
2 cups heavy cream
3 cups shredded sharp cheddar cheese
1 1/2 teaspoons salt
Directions
1. Lightly grease the insert of a white oval slow cooker. In a large bowl, toss the thin-sliced Elba potatoes with the salt so the seasoning is evenly distributed.
2. Layer one-third of the potatoes in the slow cooker, sprinkle with one-third of the cheddar, and drizzle with one-third of the heavy cream. Repeat the layers two more times, finishing with cheese on top.
3. Cover and cook on low for 4 1/2 to 5 1/2 hours, or until the potatoes are very tender when pierced with a knife and the edges are bubbling. If your slow cooker runs hot, check a little early.
4. Turn the slow cooker off and let the gratin rest uncovered for 10 to 15 minutes before serving so the creamy layers can settle slightly. Spoon out portions, making sure everyone gets some of the golden crust around the edges.
Variations & Tips
Add garlic: If you want a little more depth with the same easy method, stir 1 to 2 teaspoons garlic powder into the cream before layering. It gives the gratin a savory boost without changing the simple 4-ingredient feel.
Try another cheese: Sharp cheddar gives the boldest flavor, but a mix of cheddar and Monterey Jack makes the texture extra gooey. For a slightly more grown-up potluck version, swap in part Gruyère if you have it on hand.
Prep ahead: On busy workdays, I like to slice the potatoes in the morning and keep them in cold water in the fridge so assembly goes faster later. Just drain and pat them dry well before layering so the gratin does not get watery.
For crisper edges: Since slow cookers trap moisture, the center stays especially creamy. If you love those browned bits around the edge like my family does, let the gratin sit uncovered after cooking and serve straight from the sides of the crock first.
Keep it warm for potlucks: This dish travels well in the slow cooker insert. Once cooked, switch to the warm setting for a short window, but avoid holding it too long or the potatoes can soften more than you want.