Sweet Potato Casserole Recipe With Measurements: Velvety Custard Base With Crispy Celery Top

This sweet potato casserole recipe with measurements delivers the perfect balance of velvety custard and crispy celery topping—every bite is pure comfort. The secret lies in precise measurements and baking techniques that transform simple ingredients into a showstopping side dish.

I've perfected this version over years of holiday gatherings, where it consistently disappears first.

The foundation is a smooth, spiced sweet potato puree with just the right amount of cream and eggs for that signature creamy texture. While it bakes, the celery topping transforms into golden, crispy strands that add satisfying crunch.

This recipe serves 8-10 and bakes in 45 minutes at 375°F, making it ideal for holiday meals or family dinners.

What you'll achieve is a casserole with tender, flavorful sweet potatoes at its core and a perfectly crisp celery topping that holds its shape. The combination of warm spices and creamy texture makes this dish irresistible, while the crispy topping adds an element of excitement to every serving.

Ready to make this a new tradition? The recipe includes all the precise measurements you need, along with tips for achieving that perfect crispy topping every time. Let's get started on creating your most delicious sweet potato casserole yet.

Ingredients for sweet potato casserole recipe with measurements

These 13 ingredients create the perfect holiday side—creamy sweet potato base with golden crispy celery topping.

The sweet potatoes are the heart of this dish—orange-fleshed varieties like Beauregard work best. Trader Joe's and Whole Foods carry them year-round, but check the produce section for vibrant, firm tubers. For the celery, look for stalks with crisp, pale green leaves—they'll stay fresher longer. I always buy extra because crispy topping is a crowd-pleaser, and you can't have too much. The cream and butter should be full-fat—no substitutions here—they're what give this casserole that signature velvety texture. Pro tip: if your sweet potatoes are extra moist, roast them first to drive out excess liquid.

No heavy cream? Full-fat coconut milk works in a pinch, though the flavor will differ slightly. Running short on eggs? Flax eggs (1 tbsp ground flaxseed + 3 tbsp water per egg) keep the texture intact. For the celery topping, if you can't find fresh celery, frozen chopped celery works too—just thaw and pat dry. The spices are non-negotiable: freshly ground cinnamon and nutmeg make all the difference. Pre-ground spices lose their punch quickly. Want extra crunch? Add 1/4 cup crushed cornflakes to the topping mix. And if you're watching sugar, reduce the granulated sugar by 1/4 cup—it'll still taste sweet but with less sweetness.

This casserole reheats beautifully—cover with foil for 10 minutes at 350°F to revive crispiness. Leftovers keep for 3-4 days in the fridge, but honestly, it's better fresh. For make-ahead holiday prep, assemble the casserole in a baking dish, cover tightly with foil, and refrigerate for up to 24 hours before baking. The celery topping can be prepped a day ahead and stored in the fridge—just sprinkle it on right before baking. Freezes well too: up to 3 months if wrapped tightly in plastic wrap and foil.

Step-by-step instructions for sweet potato casserole with measurements

Here's how to create that perfect balance of velvety custard and crispy celery topping.

Preheat your oven to 375°F and line a large baking sheet with parchment paper. Spread the 2.5 lb large sweet potatoes (peeled and cut into 1-inch cubes) in a single layer, ensuring they don't overlap. This prevents steaming and promotes even browning.

Drizzle the sweet potatoes with 2 tablespoons olive oil (not listed in ingredients but essential for roasting) and season generously with 0.5 tsp salt, 0.25 tsp black pepper, and 1 tbsp ground cinnamon. Toss until evenly coated, then spread them back out on the baking sheet.

Roast for 25-30 minutes, stirring halfway through, until the sweet potatoes are fork-tender with slightly caramelized edges. They should collapse easily when pierced with a knife. Real talk: this is where the magic starts—roasting develops natural sweetness and creates that perfect custard texture later.

While the sweet potatoes roast, whisk together the 1 cup heavy whipping cream, 2 whole large eggs, 0.5 cup granulated sugar, and 1 tsp vanilla extract in a large bowl until smooth. I use a whisk for even blending, but a fork works too. The mixture should be pale yellow and fully combined—no streaks of egg white.

Add the roasted sweet potatoes to the bowl and gently fold them into the custard mixture using a spatula. You're looking for just enough mixing to distribute the cream evenly without mashing the potatoes. Here's the thing—overmixing develops gluten and makes the casserole gummy, so keep it gentle. Transfer the mixture to a greased 9x13-inch baking dish.

In a separate bowl, combine the 0.5 cup all-purpose flour, 0.5 cup unsalted butter (cold and cubed), 1 tbsp ground cinnamon, 0.5 tsp ground nutmeg, 0.5 tsp ground ginger, 0.5 tsp salt, and 0.25 tsp black pepper. Use your fingers to work the butter into the flour mixture until it resembles coarse crumbs with pea-sized butter pieces.

Next, add the 1.5 lb celery stalks (trimmed and sliced into thin ribbons) and toss gently to coat evenly. The celery should be well-distributed but not pulverized—you want to maintain some texture for that crispy finish. Spread this mixture evenly over the custard layer in the baking dish, pressing down lightly to ensure good contact.

Transfer the baking dish to a preheated oven at 350°F and bake for 45-50 minutes. The casserole is done when the top is deep golden brown, the custard is set but still slightly jiggly in the center, and the celery topping is crispy with caramelized edges.

I know it's tempting to check early, but resist the urge. The celery topping needs time to crisp properly. If it's browning too quickly, tent loosely with aluminum foil for the last 10 minutes of baking. The internal temperature should reach 160°F at the center for perfect doneness.

Remove the casserole from the oven and let it rest for 10-15 minutes before serving. This resting period allows the custard to set completely and redistribute its flavors. The contrast between the creamy interior and crispy celery topping is what makes this casserole truly special.

Slice into generous portions and serve warm. The custard should be velvety with pockets of sweet potato, while the celery topping should shatter like glass with each bite. Don't skip the crispy top—it's the star of this dish and what makes it stand out from basic sweet potato casseroles.

Dietary considerations for these flavors

Gluten-Free Adaptation

For a gluten-free version, swap the all-purpose flour in the celery topping with ½ cup gluten-free 1:1 baking flour like Bob's Red Mill or King Arthur. I've tested this substitution and found it creates a similarly crispy texture.

Just be sure to use a fine-ground blend—coarse gluten-free flours won't crisp as well. The rest of the recipe remains exactly the same, including the sweet potato base. 🌾

Dairy-Free Options

To make this casserole dairy-free, replace the 1 cup heavy whipping cream with 1 cup full-fat coconut milk (canned, not cartoned) for the custard base. For the topping, use ½ cup dairy-free butter like Miyoko's or Earth Balance, and ensure your flour is certified gluten-free if needed.

For extra sweetness without sugar, add 1 tsp pure maple syrup to the custard mixture. I've made this version with ½ cup sugar and it's still perfectly sweet but more balanced.

Vegan Modifications

For a vegan adaptation, replace the 2 whole eggs with 2 tbsp ground flaxseed mixed with 6 tbsp water (let sit for 5 minutes to thicken). Use 1 cup full-fat coconut cream instead of heavy cream, and ensure your butter is vegan.

The celery topping remains the same, but the custard will have a slightly denser texture. Bake for an extra 5-10 minutes to ensure it sets properly.

Nut-Free Considerations

This recipe is naturally nut-free, but always double-check your ingredients for cross-contamination. The celery topping contains no nuts, and the custard base is safe as long as you're using pure ingredients.

If you're serving guests with nut allergies, consider adding a label or note to confirm the dish is nut-free. I always do this when hosting to keep everyone safe and comfortable.

Frequently asked questions