Introducing a cozy favorite that’s easy to pull together: the Slow Cooker Sweet Potato Casserole with Brown Sugar Crumble. This dish earns its place on the table because it’s comforting without being fussy, and the slow cooker does most of the heavy lifting. The sweet potato base is creamy and lightly spiced, while the brown sugar crumble on top adds a little crunch and a lot of flavor. It’s the kind of recipe that feels like a warm hug, especially on a busy weeknight or during gatherings when you want one less pot to manage in the kitchen.

When I first made this, I was surprised at how much flavor came through, even with minimal stirring. The scent alone—brown sugar and cinnamon mingling with creamy potato—made everyone pause at the doorway, noses wrinkling in anticipation. If you’ve got a crowd to feed, or you simply want leftovers that taste like a small celebration, this slow-cooker casserole fits the bill.

Ingredients for this Slow Cooker Sweet Potato Casserole with Brown Sugar Crumble

Here’s what you’ll need. I’ve listed things in the order they come together, but you can assemble everything ahead of time and do the final assembly just before you start cooking.

4 cups mashed sweet potatoes (about 2–3 large sweet potatoes, baked and cooled)
1/2 cup unsalted butter, melted
1/2 cup brown sugar, packed
1/2 cup whole milk (or heavy cream for richer texture)
1 teaspoon vanilla extract
1/2 teaspoon ground cinnamon
1/4 teaspoon ground nutmeg
1/4 teaspoon salt
1 cup all-purpose flour (for crumble)
1/3 cup brown sugar (for crumble)
4 tablespoons unsalted butter, cold and cubed (for crumble)
1/4 teaspoon salt (for crumble)

Instructions

Let’s walk through it, step by step, so you feel confident from start to finish.

Lightly grease the slow cooker insert with a little butter or nonstick spray. If you’re starting from cold baked sweet potatoes, you can warm them briefly to help them blend smoothly.
In a large bowl, mash the sweet potatoes until mostly smooth. Stir in the melted butter, brown sugar, milk, vanilla, cinnamon, nutmeg, and salt. Mix until everything is well combined and creamy. If you like a few small potato chunks for texture, fold them in gently.
Spread the potato mixture evenly into the slow cooker. Smooth the surface with the back of a spoon. The layer should be about an inch thick, give or take.
Prepare the crumble: in a separate bowl, whisk together flour, brown sugar, and salt. Add the cubed cold butter. Use a pastry blender or two forks to cut the butter into the dry ingredients until the mixture resembles coarse crumbs with some pea-sized bits of butter throughout.
Sprinkle the crumble evenly over the top of the potato mixture. You should see a light, sandy coating with some larger crumb pockets for texture.
Cover and cook on low for 2 to 3 hours, or until the casserole is heated through and the top looks lightly toasted. If your slow cooker runs hot, start checking at the 2-hour mark to prevent the topping from getting too dark.
If you’d like a crisper crumble, you can switch to a high-heat finish: remove the lid for the last 15–20 minutes of cooking so the crumble browns more. Keep a close eye so it doesn’t burn.
Let the dish rest for 5–10 minutes before serving. This helps the flavors settle and makes scooping easier.

Cook and Prep Times

Prep time: 15 minutes
Cook time: 2–3 hours (low) or 1–2 hours if your slow cooker runs cooler
Total time: About 2 hours 15 minutes to 3 hours 15 minutes

If you’re starting with raw sweet potatoes, you’ll want to bake them first for 45–60 minutes at 400°F (204°C) until tender, then scoop and proceed with the rest of the steps. That adds a little time, but it’s a good way to intensify the potato sweetness.

Nutritional information

Here’s a rough breakdown per serving, bearing in mind that exact numbers can vary with the exact brands you use and how you portion things.

Calories: approx. 350
Carbohydrates: around 50 g
Sugars: about 25 g
Protein: 5 g
Fat: 15 g
Fiber: 4 g

Frequently asked questions

1. Can I make this ahead and reheat later?

Yes. You can prepare the casserole (potato base and crumble) the day before, refrigerate, and then cook the next day. If you’re starting from cold, give it an extra 30 minutes to an hour in the slow cooker on low, checking for warmth and texture. Reheating tends to firm up the crumble slightly, which some people like, so you might want to add a small splash of milk to loosen it up when serving.

2. Is there a dairy-free version?

Absolutely. Swap the butter for a dairy-free margarine or coconut oil. Use a plant-based milk like almond or oat milk. The crumble will still be delicious, though the texture may be a touch crumblier. If you’re craving extra richness, a tablespoon or two of coconut cream stirred into the potato base can help compensate.

3. Can I freeze leftovers?

Yes, leftovers freeze well. Pack individual portions in airtight containers. When ready to eat, thaw in the fridge overnight and reheat in the microwave or oven until hot. The crumble may become a bit less crisp after freezing, but it still tastes comforting and satisfying.