Cheddar-Jalapeño Mashed Potato Bake

Why You’ll Love This Recipe

• Classic mashed potato comfort, upgraded with roasty jalapeños and sharp cheddar.
• Whipped, fluffy interior with a bubbly, browned cheesy crust from a quick broil.
• Easy weeknight technique; special-occasion flavor and presentation.
• Adaptable heat level—keep it mild or go spicy with the seeds.

Grocery List

• Produce: Yukon Gold potatoes, jalapeños, scallions, garlic (optional)
• Dairy: Unsalted butter, half-and-half, sour cream, sharp cheddar
• Pantry: Olive oil, kosher salt, black pepper, smoked paprika (optional)

Full Ingredients

Potatoes & Dairy

• 3 lb Yukon Gold potatoes, peeled and cut into 1 1/2-inch chunks
• 1 tbsp kosher salt (for the boiling water)
• 6 tbsp unsalted butter
• 1 cup half-and-half
• 1/2 cup full-fat sour cream
• 2 garlic cloves, lightly smashed (optional, for infusing the dairy)

Flavor & Finish

• 3–4 fresh jalapeños (about 3–4 oz/85–115 g), stems removed
• 1 tbsp olive oil
• 4 scallions, thinly sliced (about 1/2 cup), divided
• 10 oz (about 2 1/2 cups) sharp cheddar cheese, coarsely shredded, divided (8 oz for the potatoes, 2 oz for topping)
• 1 tsp kosher salt, or to taste
• 1/2 tsp freshly ground black pepper
• 1/2 tsp smoked paprika (optional, for color on top)
• 1 tbsp unsalted butter, for greasing the baking dish

Step-by-Step Instructions

Step 1: Heat the oven and start the potatoes

Preheat the oven to 425°F (220°C). Generously butter a 2-quart baking dish (an 8×11-inch or 9-inch square dish works well). Place the potato chunks in a large pot, cover with cold water by 1 inch, and add 1 tablespoon kosher salt. Bring to a boil over high heat, then reduce to a gentle simmer and cook until a fork slides in easily, 12–15 minutes.

Step 2: Roast the jalapeños

While the potatoes cook, place the jalapeños on a small sheet pan. Drizzle with 1 tablespoon olive oil and a pinch of salt, then roast at 425°F (220°C) for 10–12 minutes, turning once, until blistered and blackened in spots. Transfer to a bowl and cover for 5 minutes to steam, then peel off the loose skin, remove seeds for mild heat (leave some seeds for extra kick), and finely chop. Slice the scallions, reserving a small handful for garnish.

Step 3: Warm the dairy

In a small saucepan over low heat, combine the butter, half-and-half, and optional smashed garlic. Warm gently until steaming and the butter is melted, 3–5 minutes; do not boil. Remove the garlic. Off the heat, whisk in the sour cream until smooth and warm.

Step 4: Drain, steam-dry, and mash

Drain the potatoes very well, then return them to the hot pot over low heat for 1–2 minutes, shaking occasionally to steam off excess moisture. Mash with a potato masher or press through a ricer for extra fluffiness.

Step 5: Fold in cheese, jalapeños, and scallions

Pour the warm dairy mixture over the potatoes and stir just until combined and creamy. Fold in 8 oz of the shredded cheddar, the chopped jalapeños, and most of the scallions. Season with 1 tsp kosher salt and 1/2 tsp black pepper (taste and adjust).

Step 6: Bake, then broil for a crust

Spoon the potatoes into the buttered dish and make wavy ridges on top (they brown beautifully). Sprinkle with the remaining 2 oz cheddar and the smoked paprika if using. Reduce oven temperature to 375°F (190°C) and bake for 15–18 minutes until hot and the cheese is melted. Switch the oven to broil (high) and broil 2–4 minutes, watching closely, until the top is deeply golden and bubbly.

Step 7: Rest and serve

Let the bake rest for 5 minutes to set. Sprinkle with the reserved scallions, scoop into generous portions, and serve warm.

Pro Tips

• Use Yukon Golds for naturally creamy texture; russets also work and whip up very fluffy.
• Warm dairy prevents gumminess and keeps the mash silky.
• Steam-dry the potatoes after draining to avoid watery mash.
• Make ridges on the surface so the broiler can create more browned-cheesy peaks.
• For spicier heat, keep some jalapeño seeds; for mild, remove them all and add only the roasted flesh.

Variations

• Bacon-jalapeño cheddar: Fold in 4 slices crisp-cooked, crumbled bacon and a pinch more smoked paprika.
• Hatch chile and pepper jack: Swap jalapeños for roasted Hatch chiles and use a mix of sharp cheddar and pepper jack.
• Extra creamy: Add 3 oz softened cream cheese when you mix in the dairy for an ultra-lush mash.

Storage & Make-Ahead

Assemble up to 2 days ahead: prepare through Step 5, spread in the dish, cool, cover, and refrigerate. Reheat covered at 350°F (175°C) for 30–40 minutes until hot; uncover and broil 2–4 minutes for a fresh crust. Leftovers keep 3–4 days refrigerated; reheat covered at 350°F (175°C) for 15–20 minutes or microwave in short bursts, adding a splash of milk if needed. Freeze (tightly wrapped) up to 2 months; thaw overnight in the fridge before reheating.

Nutrition (per serving)

Approximate: 560 calories; 20 g protein; 41 g carbohydrates; 38 g fat; 22 g saturated fat; 3 g fiber; 820 mg sodium. Values will vary with ingredient brands and salt used.