Crockpot Sweet Potato Casserole Recipe for Busy Weeknights

This crockpot sweet potato casserole is my go-to when the oven is packed on Thanksgiving. Store-bought casseroles never get that slow-cooked caramelized edge. A few pantry staples and a slow cooker give you a tender, marshmallow-topped side dish with almost no hands-on time.

Why This Crockpot Sweet Potato Casserole Works

The slow cooker does something the oven struggles to do. It builds heat evenly from all sides, softening the sweet potatoes all the way through without drying the edges. You get a creamy, caramelized base that holds together when scooped.

The brown sugar and butter melt into the potatoes as they cook. The mixture turns thick and glossy, with edges that brown and pull away from the crock. That contrast between the rich potato layer and the crispy pecan topping is the whole point.

I started making this crockpot version because Thanksgiving oven space is impossible. Now I make it year-round just for the hands-off convenience. The recipe takes 15 minutes to assemble and the slow cooker handles the rest.

Ingredients

• 3 pounds (1.4 kg) sweet potatoes, peeled and cut into 1-inch cubes
• 3 tablespoons unsalted butter, melted
• 3 tablespoons brown sugar, packed
• 1 teaspoon vanilla extract
• 1 teaspoon ground cinnamon
• 1/4 teaspoon ground nutmeg
• 1/4 teaspoon salt
• 1/2 cup chopped pecans
• 1 cup mini marshmallows

What You Need for Crockpot Sweet Potato Casserole

Sweet potatoes — cut to 1-inch cubes so they cook through evenly. Larger chunks stay firm in the center; smaller ones turn mushy.

Unsalted butter — adds richness and helps the brown sugar caramelize against the potato. Salted butter works; just skip the added salt.

Brown sugar — packed dark brown sugar gives deeper molasses flavor. Light brown sugar works but the caramel notes are milder.

Vanilla extract — pure vanilla deepens the sweetness without making it candy-like. Imitation vanilla works in a pinch.

Ground cinnamon and nutmeg — these two spices are what makes this taste like Thanksgiving. Adjust to taste; I go heavy on the cinnamon.

Pecans — add crunch to the soft potato base. Walnuts substitute well. Toast them first for extra nuttiness.

Mini marshmallows — added in the last 30 minutes so they soften without dissolving completely. Regular marshmallows cut in half work too.

How to Make Crockpot Sweet Potato Casserole

1. Peel and cube sweet potatoes into 1-inch (2.5 cm) pieces.
2. Add sweet potatoes to the slow cooker insert.
3. In a small bowl, mix melted butter, brown sugar, vanilla extract, cinnamon, nutmeg, and salt.
4. Pour the butter mixture over the sweet potatoes and stir to coat evenly.
5. Cover and cook on high for 2.5 to 3 hours, until the sweet potatoes are fork-tender and the edges are browned.
6. Scatter chopped pecans over the top of the cooked sweet potatoes.
7. Spread mini marshmallows in an even layer over the pecans.
8. Cover and cook on high for an additional 20 to 30 minutes, until the marshmallows are soft and lightly toasted.
9. Serve directly from the slow cooker.

Crockpot Sweet Potato Casserole Variations

Crockpot Sweet Potato Casserole with Pecan Streusel

Skip the marshmallows and make a streusel topping instead. Combine 1/2 cup flour, 1/3 cup brown sugar, 3 tablespoons cold butter, and 1/2 cup chopped pecans. Add the streusel in the last 30 minutes of cooking. The topping stays crumbly and golden.

Maple Crockpot Sweet Potato Casserole

Replace the brown sugar with 3 tablespoons of pure maple syrup. The maple flavor is less sweet and more complex. Add a pinch of cloves alongside the cinnamon and nutmeg for a warmer spice profile.

Savory Herb Version

Skip the sugar and marshmallows entirely. Toss the sweet potatoes with olive oil, rosemary, thyme, and grated Parmesan. Cook on high for 2.5 hours. The result is creamy and savory, a good side for roasted chicken or pork.

Vegan Crockpot Sweet Potato Casserole

Use coconut oil in place of butter. Skip the marshmallows or use vegan marshmallows. The coconut oil adds a slight tropical note that works well with the cinnamon. Top with toasted pecans and a drizzle of maple syrup just before serving.

Tips for the Best Crockpot Sweet Potato Casserole

• I cut the sweet potatoes into uniform 1-inch pieces so every cube cooks at the same rate.
• Coat the slow cooker insert with cooking spray before adding the potatoes — the sugary coating sticks without it.
• Do not add the marshmallows until the last 30 minutes or they disappear into the liquid.
• Check for doneness at 2.5 hours — crockpot temperatures vary and some run hot.
• For a thicker base, mash a quarter of the potatoes with a fork before adding the toppings.
• This recipe doubles easily for a crowd — use a 7-quart slow cooker and add 30 extra minutes.

Make Ahead & Storage

This crockpot sweet potato casserole keeps in the fridge for up to 5 days in a sealed container. I let it cool completely before covering so no condensation softens the marshmallows overnight.

To make ahead, assemble and cook the potato base up through step 5, then refrigerate overnight. On serving day, reheat on low in the slow cooker for 1.5 to 2 hours, then add the pecans and marshmallows for the final 30 minutes.

To freeze, skip the marshmallows. Freeze the potato-pecan base in a freezer-safe container for up to 3 months. Thaw overnight in the fridge, reheat in the slow cooker on low for 2 hours, then add marshmallows for the last 30 minutes.

Common Questions

Can I make crockpot sweet potato casserole the night before?

Yes. Cook the potato base completely, let it cool, and refrigerate overnight. Reheat on low in the slow cooker for about 2 hours on serving day, then add the pecans and marshmallows for the last 30 minutes.

Do I need to peel sweet potatoes for this recipe?

I recommend peeling them. The skins stay firm and chewy even after slow cooking, which breaks up the smooth texture. If you prefer to leave them on, scrub well and cut into smaller pieces.

Can I cook this on low instead of high?

Yes. Cook on low for 5 to 6 hours instead of high for 2.5 to 3. Check at 5 hours — slow cookers vary. The results are equally tender on either setting.

Why did my marshmallows dissolve completely?

They were added too early. Marshmallows need to go in during the final 20 to 30 minutes only. If added at the start, the liquid from the potatoes fully dissolves them before serving.

Can I use canned sweet potatoes instead of fresh?

Yes. Drain two 29-ounce cans of sweet potatoes and reduce cooking time to 1.5 hours on high, since they are already cooked. Expect a softer, slightly mushier texture compared to fresh.

This crockpot sweet potato casserole is the easiest way to free up oven space during the holidays. Save this recipe and tap the link for step-by-step instructions at MillennialHawk.com.