# Mayonnaise Is the Secret to Crispy Roasted Potatoes

Home cooks have long relied on olive oil or butter to achieve golden, crispy roasted potatoes. But mayonnaise delivers superior results, creating a crust that's both crunchier and more flavorful than either conventional fat alone.

The science behind mayo's effectiveness lies in its composition. Mayonnaise is an emulsion of oil, egg yolks, and acid (typically vinegar or lemon juice). This combination works on potatoes in three ways. First, the oil content coats the potato surfaces evenly, promoting browning through the Maillard reaction. Second, the egg yolk acts as a binder, helping seasonings adhere to the potato and preventing them from falling off during roasting. Third, the emulsified structure creates a protective layer that locks in moisture while allowing the exterior to crisp.

When potatoes roast in mayo at high heat, the egg proteins denature and create a more stable crust than oil or butter alone can achieve. The acid component also contributes subtle tang that complements potato starch. The result tastes richer and more savory than olive oil preparations, without tasting mayonnaise-forward.

The method is straightforward. Toss cut potatoes with mayonnaise until lightly coated. Use less mayo than you would olive oil, since the emulsion spreads further and clings more efficiently to the potato surface. Season generously with salt and pepper, then roast at 425 to 450 degrees Fahrenheit for 25 to 35 minutes, stirring halfway through. The potatoes emerge with deeply caramelized, crispy exteriors and creamy centers.

This technique challenges conventional wisdom that butter and olive oil are the only viable roasting fats. Home cooks already use mayo for potato salads and slaws, so the ingredient sits readily available in most refrigerators. The approach works equally well for roasted root vegetables like carrots, parsnips, and beets. Some cooks extend the technique to chicken thighs and other proteins, though mayo's egg base makes it particularly suited to starches.

The discovery reflects a broader shift in how home cooks approach technique. Social media platforms and food blogs have democratized once-professional methods, allowing amateurs to experiment with unconventional applications of familiar ingredients. Mayo-roasted potatoes exemplify this trend, proving that effective cooking often relies on understanding why ingredients work rather than blindly following tradition.

Food writers at The Kitchn highlighted this approach in recent coverage, noting that the method produces consistently superior results across multiple tests. The technique requires no special equipment or hard-to-find ingredients, making it accessible to any home cook with a sheet pan and an oven.

This shift also has practical implications for home cooking budgets. Mayonnaise costs less per ounce than premium olive oils in many grocery stores, particularly when buying store brands. Using mayo for roasting can reduce the temptation to waste expensive extra-virgin oils on high-heat cooking, reserving them instead for finishing dishes where their delicate flavors shine.