Copycat Boston Market Sweet Potato Casserole Recipe – Cozy, Crunchy, and Crowd-Pleasing

This sweet potato casserole tastes like the one you remember from Boston Market—silky smooth sweet potatoes topped with a buttery pecan streusel and a hint of marshmallow melt. It’s rich, cozy, and perfect for holidays or Sunday dinners. The best part: it’s easy to make ahead, and the leftovers are just as good.

If you love a balance of creamy, crunchy, sweet, and toasty, this one hits every note.

Why This Recipe Works

• Balanced sweetness: A touch of brown sugar and maple keeps the filling gently sweet without turning it into dessert.
• Ultra-creamy base: Butter and a splash of cream create a silky texture that holds up under the topping.
• Signature crunch: A pecan-brown sugar streusel delivers that familiar crispy top, with optional mini marshmallows for extra gooey contrast.
• Make-ahead friendly: Both the filling and topping can be prepped in advance and baked when you’re ready.
• Reliable bake: The method ensures the casserole sets nicely while staying soft and scoopable.

Ingredients

• For the sweet potato base:
  • 4 large sweet potatoes (about 3 pounds), scrubbed
  • 4 tablespoons unsalted butter, softened
  • 1/3 cup light brown sugar, packed
  • 2 tablespoons maple syrup (or honey)
  • 1/4 cup heavy cream (or half-and-half)
  • 1 teaspoon vanilla extract
  • 1/2 teaspoon ground cinnamon
  • 1/4 teaspoon ground nutmeg
  • 1/2 teaspoon kosher salt
  • Optional: 1 large egg, lightly beaten (for a slightly firmer set)
• For the streusel topping:
  • 1/2 cup all-purpose flour
  • 1/2 cup light brown sugar, packed
  • 1/2 teaspoon cinnamon
  • 1/4 teaspoon kosher salt
  • 1/2 cup chopped pecans
  • 4 tablespoons unsalted butter, melted
• Optional finishing touch:
  • 1 to 1 1/2 cups mini marshmallows

Step-by-Step Instructions

1. Cook the sweet potatoes: Preheat oven to 400°F (200°C). Pierce sweet potatoes a few times with a fork. Place on a foil-lined baking sheet and bake 50–60 minutes, until very tender when pierced. Let cool slightly, then scoop out the flesh.
2. Mash the base: Reduce oven to 350°F (175°C). In a large bowl, mash the sweet potato flesh until smooth. Add butter, brown sugar, maple syrup, cream, vanilla, cinnamon, nutmeg, and salt. Mix until creamy. If using, stir in the beaten egg.
3. Spread in the dish: Lightly grease a 9×13-inch baking dish (or similar 3-quart casserole). Spread the sweet potato mixture evenly in the dish.
4. Make the streusel: In a medium bowl, stir together flour, brown sugar, cinnamon, salt, and pecans. Drizzle in melted butter and mix with a fork until clumps form.
5. Top and bake: Sprinkle the streusel evenly over the sweet potato base. Bake for 25–30 minutes, until the topping is golden and the edges are bubbling slightly.
6. Add marshmallows (optional): Remove the dish, scatter mini marshmallows over the top, and return to the oven for 5–7 minutes, just until lightly toasted. For extra color, switch to broil for 30–60 seconds, watching closely.
7. Rest and serve: Let the casserole rest for 10 minutes to set. Serve warm.

Storage Instructions

• Refrigerator: Cool completely, cover tightly, and refrigerate for up to 4 days.
• Freezer: Assemble without marshmallows, wrap well, and freeze up to 2 months. Thaw in the fridge overnight, then bake until hot; add marshmallows at the end.
• Reheating: Warm individual portions in the microwave, or reheat the whole dish covered at 325°F until heated through. Uncover for the last 5–10 minutes to re-crisp the topping.
• Make-ahead: Prepare the base and topping separately up to 2 days ahead.Refrigerate both. Assemble just before baking for best texture.

Health Benefits

• Rich in nutrients: Sweet potatoes are packed with beta carotene (vitamin A), vitamin C, potassium, and fiber.
• Energy support: The complex carbs provide steady energy, especially helpful at big meals.
• Antioxidants: The orange flesh signals antioxidant content that supports immune function and eye health.
• Easy to adjust: You can reduce sugar, swap half the butter for Greek yogurt, or use nuts for healthy fats without losing flavor.

Common Mistakes to Avoid

• Using undercooked potatoes: If the potatoes aren’t fully tender, the mash will be lumpy. Bake until a knife slides in easily.
• Overmixing with an electric mixer: It can make the texture gluey.A masher or whisk gives a smoother, natural feel.
• Adding marshmallows too early: They’ll melt and burn. Add in the last minutes of baking.
• Skipping salt: A little salt sharpens the flavors and keeps the sweetness in check.
• Soggy topping: Don’t cover the dish while baking, and avoid too much butter in the streusel. You want defined crumbs, not paste.

Recipe Variations

• Pecan-only top: Skip the marshmallows and double the pecans for extra crunch.
• Oat streusel: Swap half the flour for rolled oats for a heartier topping.
• Spice it up: Add 1/4 teaspoon ground ginger or cardamom to the base for warmth.
• Dairy-light: Use coconut milk instead of cream and coconut oil in the streusel for a subtle tropical note.
• Less sweet: Cut brown sugar in the base to 2 tablespoons and skip the maple; rely on the natural sweetness of the potatoes.
• Mini ramekins: Bake in individual dishes for portion control and faster baking (check at 18–20 minutes).

FAQ

Can I use canned sweet potatoes?

Yes.

Drain them well and pat dry to remove excess liquid. You’ll need about 6–7 cups mashed. Reduce added sugar slightly, since canned versions can be sweeter.

Do I have to add the egg?

No.

The egg helps the base set a bit more, but the casserole holds together without it. Skip it for an ultra-creamy, scoopable texture.

Can I boil the sweet potatoes instead of baking?

You can, but baking concentrates flavor and keeps them from getting watery. If you boil, drain very well and let steam off moisture before mashing.

How do I toast the marshmallows without overbaking the casserole?

Bake the casserole until hot and the streusel is golden.

Add marshmallows in the last few minutes, or broil briefly while watching constantly.

What can I substitute for pecans?

Walnuts, sliced almonds, or a mix of seeds (pumpkin and sunflower) work well. For nut-free, use oats and seeds for crunch.

Can I cut the recipe in half?

Absolutely. Use an 8×8-inch dish and start checking for doneness around 18–20 minutes after adding the topping.

How do I keep the topping crisp for leftovers?

Reheat uncovered in the oven or toaster oven so the streusel re-crisps.

Avoid microwaving large portions if possible.

Is this similar to Boston Market’s version?

It’s a close copycat with a creamy spiced base and buttery pecan topping, plus the option for marshmallows to mirror that nostalgic flavor and texture.

In Conclusion

This Copycat Boston Market Sweet Potato Casserole delivers the best of both worlds: a velvety, lightly spiced base and a crisp, indulgent topping. It’s simple to prep, easy to customize, and reliable for any gathering. Serve it at Thanksgiving, a potluck, or a cozy family dinner—just expect it to disappear fast.