Homestyle Potato and Onion Casserole
A creamy, comforting casserole featuring tender potatoes and caramelized onions baked until golden, ideal for weeknight dinners. This american-inspired one pot ready in about 60 minutes pairs medium, finely chopped yellow onions, tablespoons butter, heavy cream for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 420 calories and feeds 6, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.
Ingredients
- 2 pounds, peeled and diced into 1/2-inch cubes russet potatoes
- 2 medium, finely chopped yellow onions
- 3 tablespoons butter
- 1 cup heavy cream
- 1/2 cup whole milk
- 1 cup, grated sharp cheddar cheese
- 1.5 tablespoons salt
- 1/2 teaspoon black pepper
- 1 teaspoon dried thyme
Instructions
- Step 1: Preheat oven to 375°F. Grease a 9x13-inch baking dish with 1 tablespoon butter.
- Step 2: In a large pot, bring 4 quarts of water with 1 tablespoon salt to a boil. Add 2 pounds diced potatoes and cook for 10 minutes until slightly tender. Drain and set aside.
- Step 3: Melt 2 tablespoons butter in a large skillet over medium heat. Add 2 medium chopped onions and cook for 5 minutes until golden brown, stirring occasionally.
- Step 4: In a medium bowl, whisk together 1 cup heavy cream, 1/2 cup whole milk, 1/2 teaspoon salt, 1/2 teaspoon black pepper, and 1 teaspoon dried thyme.
- Step 5: In the baking dish, layer half of the cooked potatoes, then half of the onions, then the remaining potatoes and onions. Pour the cream mixture evenly over the top.
- Step 6: Sprinkle 1 cup grated cheddar cheese evenly over the surface.
- Step 7: Bake for 30-35 minutes until the cheese is melted and bubbly and edges are golden, then let rest for 10 minutes before serving.
Equipment for this recipe
Top-rated tools to make this recipe successfully.
Frequently asked questions
How long does Homestyle Potato and Onion Casserole take to make?
Total time is about 60 minutes (25 min prep + 35 min cook). Most home cooks find this fits comfortably into a weeknight; double the batch on Sunday for two dinners.
How do I store leftover Homestyle Potato and Onion Casserole?
Cool to room temperature within 2 hours, then store in an airtight container in the fridge for up to 4 days. Reheat covered in a 350°F oven for 10-12 minutes, or microwave at 70% power in 60-second bursts to keep tablespoons butter from drying out.
Can I substitute ingredients in Homestyle Potato and Onion Casserole?
Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.
How do I scale Homestyle Potato and Onion Casserole for a different number of people?
The recipe is written for 6 servings. Multiply each ingredient by (your serving target / 6). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.
What goes well with Homestyle Potato and Onion Casserole?
American one pot like this pair well with a simple grain (rice, couscous, or crusty bread), a quick salad with acid (lemon vinaigrette, pickled onions), and a pan sauce or yogurt-based dip. Tap "Plan a meal with the AI" to get specific side suggestions.
What others are saying
- ★★★★☆
Reliable weeknight option. Not going to blow your mind but always satisfying.
- ★★★★☆
My family liked it. I personally would prefer more depth of flavor.
- ★★★★☆
My family liked it. I personally would prefer more depth of flavor.
