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
Equipment for this recipe
Top-rated tools to make this recipe successfully.
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.
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.
