Sweet Potato Banana Casserole with Cornflake Crunch
A nostalgic casserole combining creamy sweet potato and banana base with alternating stripes of buttery cornflake topping and toasted mini marshmallows. Warm spice notes from vanilla and pecans make this ideal for holiday tables or potluck gatherings. The textural contrast between the soft filling and crispy-chewy topping distinguishes this from standard sweet potato casseroles.
Ingredients
- 2 cup cornflakes, lightly crushed
- 2 tablespoon light brown sugar
- 2 tablespoon unsalted butter, melted
- 1 cup mini marshmallowslarge marshmallows halvedapprox 1:1 by countvegetarianFull guide →
- 40 ounce canned sweet potatoes in syrup, drained and warmedroasted fresh sweet potato400g roasted and mashedFull guide →
- ½ cup banana, mashed, about 2 small
- ¼ cup granulated or brown sugar
- 2 large eggs
- 1 teaspoon pure vanilla extract
- 1 pinch salt
- ½ cup unsalted butter, melted
- ½ cup pecan halves, chopped
Instructions
- 1
Preheat oven to 350 degrees F and butter a 2 quart casserole dish.
- 2
Combine cornflakes with brown sugar, stir in melted butter, and set aside.
- 3
Beat warmed sweet potatoes with mixer until creamy.
- 4
Add banana, sugar, eggs, vanilla, and salt; beat until blended without overbeating.
- 5
Fold in pecans and transfer mixture to prepared casserole.
- 6
Arrange 2 rows of cornflake mixture diagonally across center, leaving space between rows.
- 7
Add 2 more rows of cornflake mixture along each edge of dish.
- 8
Fill empty rows with mini marshmallows.
- 9
Bake uncovered 25-30 minutes until marshmallows turn golden brown.
Tips
Don't overbeat the sweet potato mixture after adding wet ingredients; this prevents a dense, gummy texture in the final casserole.
Toast pecans briefly in a dry pan before chopping to intensify their nutty flavor and add depth to the dish.
Arrange cornflake and marshmallow rows while filling is still warm for easier handling and better visual presentation.
Good to Know
Cover and refrigerate up to 4 days. Reheat covered at 325 degrees F for 15-20 minutes until warmed through.
Prepare filling and cornflake mixture separately up to 1 day ahead. Assemble and bake just before serving for best marshmallow texture, or bake ahead and warm gently.
Serve warm as a side dish at holiday dinners, potlucks, or family gatherings. Pairs well with savory mains like turkey, ham, or roasted chicken.
Common Mistakes
Overbeat the sweet potato mixture to avoid a dense, gummy casserole texture
Skip toasting pecans to avoid muted, flat flavor in the filling
Arrange toppings too close together to avoid marshmallows melting onto cornflakes and losing crunch
Substitutions
Vegan Options
General Alternatives
FAQ
Can I use fresh sweet potatoes instead of canned?
Yes. Roast or bake 2-3 medium sweet potatoes until very soft, then mash to yield approximately 2 cups. Omit the syrup from the canned version. Fresh potatoes create a slightly less sweet, earthier result.
What if I don't have mini marshmallows?
Halve large marshmallows or use marshmallow fluff spread in rows, though texture will differ. Standard marshmallows take longer to brown; increase baking time by 5-10 minutes and watch carefully.
How long can I keep this casserole, and can I freeze it?
Refrigerate covered up to 4 days. Freezing is not recommended due to marshmallow and cornflake texture degradation when thawed. Reheat gently to avoid marshmallow over-melting.