Cheesy Jalapeño Potato Gratin with Caramelized Onions
Layers of thinly sliced potatoes baked with caramelized onions, spicy jalapeños, and melted cheddar cheese for a rich, comforting side dish. This comfort food-inspired vegetarian ready in about 80 minutes pairs large, thinly sliced onion, thinly sliced jalapeños, shredded cheddar cheese for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 350 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
- 4 medium, thinly sliced into 1/8-inch rounds potatoes
- 2 large, thinly sliced onion
- 3, thinly sliced jalapeños
- 2 cups shredded cheddar cheese
- 1 cup heavy cream
- 3 tbsp unsalted butter
- 2 cloves, minced garlic
- 1 1/2 tsp salt
- 1 tsp black pepper
- 1 tsp fresh or 1/2 tsp dried thyme leaves
Instructions
- Step 1: Preheat oven to 375°F. In a large skillet, melt 3 tbsp unsalted butter over medium heat. Add 2 thinly sliced large onions and 2 minced garlic cloves, cooking for 15 minutes, stirring often until onions are golden and caramelized.
- Step 2: Stir in 3 thinly sliced jalapeños, 1 tsp salt, 1 tsp black pepper, and 1 tsp thyme leaves; cook for 2 more minutes until fragrant.
- Step 3: Butter a 9x13-inch baking dish and layer half of the 4 thinly sliced medium potatoes evenly.
- Step 4: Spread half of the caramelized onion and jalapeño mixture over the potatoes, then sprinkle 1 cup shredded cheddar cheese evenly on top.
- Step 5: Repeat layering with remaining potatoes, onions, and 1 cup cheddar cheese.
- Step 6: Pour 1 cup heavy cream evenly over the layered potatoes.
- Step 7: Cover with foil and bake for 45 minutes. Remove foil and bake for an additional 15 minutes until the top is golden brown and bubbly.
- Step 8: Let cool for 10 minutes before serving warm.
Equipment for this recipe
Top-rated tools to make this recipe successfully.
Frequently asked questions
How long does Cheesy Jalapeño Potato Gratin with Caramelized Onions take to make?
Total time is about 80 minutes (20 min prep + 60 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 Cheesy Jalapeño Potato Gratin with Caramelized Onions?
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 large, thinly sliced onion from drying out.
Can I substitute ingredients in Cheesy Jalapeño Potato Gratin with Caramelized Onions?
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 Cheesy Jalapeño Potato Gratin with Caramelized Onions 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 Cheesy Jalapeño Potato Gratin with Caramelized Onions?
Comfort Food vegetarian 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.
