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Easy Sweet Potato Casserole With Canned Yams

Name: Easy Sweet Potato Casserole With Canned Yams
Prep time: 10 min
Cook time: 30 min
Total time: 40 min
Ingredients: 29 ounces sweet potatoes (yams, drained (about 2 cans)); 1/4 cup brown sugar; 2 tablespoons maple syrup; 3 tablespoons unsalted butter; 1 teaspoon salt; 1 teaspoon ground cinnamon (optional); 1/2 teaspoon vanilla extract; 1/2 cup pecans (diced and divided); 1 cup mini marshmallows

Author: Laurie Fleming
Published: January 11, 2023

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This sweet potato casserole with canned yams is the shortcut holiday side dish you’ve been waiting for. Made with canned yams, brown sugar, and warm spices, then topped with gooey marshmallows or crunchy pecans, it delivers that classic, comforting flavor in just 40 minutes—no peeling, boiling, or fuss required. Whether it’s for Thanksgiving, Christmas, or an easy weeknight dinner, this is the casserole that always disappears first.

Sweet potato casserole with canned yams topped with golden marshmallows, served on a white plate

It earns its spot on the table next to other no-stress favorites like air fryer frozen green beans and a pan of air fryer cornbread sausage stuffing.

Why You’ll Love This Canned Yam Casserole

Ready in 40 minutes. Canned yams cut prep time in half—no peeling or boiling.
Pantry-staple ingredients. Everything comes together from cans and basics you likely already have.
Classic holiday flavor. Sweet, spiced, and topped just the way you like it.
Make-ahead friendly. Assemble it the day before and bake when you’re ready.
Totally customizable. Marshmallow topping, pecan topping, or both.
Crowd-pleasing. Kids and grown-ups go back for seconds every time.

Ingredients You’ll Need

Here’s everything that goes into this easy canned sweet potato casserole. Full measurements are in the recipe card below.

Canned yams, brown sugar, pecans, butter, and marshmallows laid out for sweet potato casserole

Canned yams (sweet potatoes) – Drained well. Peeled, cooked fresh sweet potatoes work too.
Brown sugar – For deep, caramel sweetness. Granulated white sugar works in a pinch.
Butter – Unsalted, for the richest flavor.
Maple syrup – Adds a layer of warm, natural sweetness.
Salt – Balances all that sweetness.
Ground cinnamon – Optional, but it adds classic holiday warmth.
Vanilla extract – Rounds out the flavor of the mashed yams.
Pecans – Diced, for a buttery crunch in the filling and on top. A handful of copycat Buc-ee’s pecans makes a fun upgrade.
Mini marshmallows – For that gooey, golden topping. If you love them extra toasty, try the trick behind these air fryer roasted marshmallows.

How to Make Sweet Potato Casserole With Canned Yams

Mashing drained canned yams with brown sugar and spices in a glass mixing bowl

Step One: Prep the dish. Grease an 11×7-inch baking dish with unsalted butter or non-stick cooking spray.

Step Two: Mash the filling. Drain the canned yams well and add them to a large bowl. Fold in the brown sugar, butter, salt, ground cinnamon, and vanilla. Mash with a potato masher (or use a hand mixer or food processor) until you reach your preferred texture. Fold in about 1/3 cup of the diced pecans.

Step Three: Assemble. Spread the mashed sweet potato mixture into the prepared dish. Scatter the remaining pecans over the top, then sprinkle on the mini marshmallows.

Step Four: Bake. Bake in a preheated 375°F oven for 25–30 minutes, until warmed through and the marshmallows are golden brown.

Step Five: Serve. Finish with a drizzle of maple syrup or melted butter and a dash of brown sugar or cinnamon, if you like.

Baked canned yam casserole with bubbling, toasted marshmallow topping in a white dish

Recipe Tips for the Best Casserole

Drain the yams thoroughly. Excess liquid makes the casserole watery—drain well before mashing.
Mash to your texture. Go smooth for a creamy casserole, or leave some chunks for a rustic feel.
Taste before adding sugar. Canned yams are often packed in syrup, so adjust the sweetness to suit.
Use real butter. It adds richness that balances the sweetness perfectly.
Layer in warm spices. A pinch of nutmeg or pumpkin spice alongside the cinnamon deepens the flavor.
Toast the topping. For a perfectly golden finish, broil the last 1–2 minutes—just watch it closely.
Make it ahead. Assemble a day in advance, refrigerate, and bake just before serving.

Storage Instructions

Refrigerate: Cool completely, cover tightly or transfer to an airtight container, and store for up to 4 days.

Freeze: Wrap the fully cooled casserole in plastic wrap and foil (or use a freezer-safe container) and freeze for up to 2 months. For best results, freeze without the marshmallows and add them fresh before baking.

Reheat: Warm in a 325°F oven for 15–20 minutes, microwave individual servings for 1–2 minutes, or crisp slices in the air fryer at 320°F for 4–6 minutes.

Close-up of melty marshmallow-topped sweet potato casserole fresh from the oven

What to Serve With Sweet Potato Casserole

This casserole leans sweet, so it loves a savory, salty partner on the plate. A crisp batch of air fryer frozen crispy breaded green beans or buttery, tender Instant Pot green beans balances things out beautifully. And no holiday plate is complete without stuffing—our air fryer stuffing is fast and crispy-edged, while this Instant Pot stuffing frees up your oven for the casserole.

Frequently Asked Questions

Can I use fresh sweet potatoes instead of canned yams? Yes. Peel, boil, and mash about 3–4 medium sweet potatoes to replace the canned yams.

Do I need to rinse or drain the canned yams? Drain them well to avoid extra moisture. You only need to rinse if they’re packed in heavy syrup and you want to cut the sweetness.

Can I make this ahead of time? Absolutely. Assemble the casserole, cover, and refrigerate up to 24 hours in advance. Add the toppings just before baking.

Can I freeze sweet potato casserole? Yes—freeze it without the topping for best results. Thaw overnight in the fridge, then add marshmallows or pecans right before reheating.

Which topping is best, marshmallows or pecans? It comes down to taste. Marshmallows give a gooey, sweet finish, while pecans add a buttery crunch. Use both for the best of both worlds.

How do I know when it’s done? The edges should be bubbly and the top golden brown, about 25–30 minutes at 375°F.

Easy sweet potato casserole with canned yams topped with marshmallows and pecans

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