Sweet Potato Pie Bars with Toasted Marshmallow Meringue

Why You’ll Love This Recipe

• All the cozy flavors of sweet potato pie, packaged as easy-to-serve bars.
• Buttery graham crust for crunch, silky spiced filling, and a billowy toasted marshmallow meringue cap.
• Swiss-style meringue is glossy, stable, and safe—perfect for make-ahead entertaining.
• Finishing touch of pecan dust adds nutty aroma and a pretty, sophisticated look.

Grocery List

• Produce: 2–3 large sweet potatoes (to yield 3 cups mashed)
• Dairy: Unsalted butter, evaporated milk, eggs
• Pantry: Graham crackers, granulated sugar, light brown sugar, powdered sugar, light corn syrup, cornstarch, vanilla extract, ground cinnamon, ginger, nutmeg, cloves, salt, pecans

Full Ingredients

Graham Crust

• 2 cups (200 g) graham cracker crumbs
• 2 tbsp light brown sugar
• 1/2 tsp fine sea salt
• 1/2 tsp ground cinnamon
• 7 tbsp (100 g) unsalted butter, melted

Sweet Potato Filling

• 3 cups (660 g) mashed roasted sweet potato (from about 2–3 large sweet potatoes)
• 3 large eggs
• 1 cup (240 ml) evaporated milk
• 4 tbsp (57 g) unsalted butter, melted and cooled
• 1/2 cup (110 g) packed light brown sugar
• 1/3 cup (67 g) granulated sugar
• 1 tbsp (8 g) cornstarch
• 1 tsp vanilla extract
• 1 tsp ground cinnamon
• 1/2 tsp ground ginger
• 1/4 tsp ground nutmeg
• 1/8 tsp ground cloves
• 1/2 tsp fine sea salt

Marshmallow Meringue

• 4 large egg whites (120 g), room temperature
• 3/4 cup (150 g) granulated sugar
• 2 tbsp (30 ml) light corn syrup
• 1/4 tsp cream of tartar
• 1 tsp vanilla extract
• Pinch fine sea salt

Pecan Dust

• 1/4 cup (28 g) pecan halves or pieces, toasted
• 1 tsp powdered sugar
• Pinch flaky sea salt

Step-by-Step Instructions

Step 1: Roast the sweet potatoes

Heat the oven to 400°F (200°C). Scrub 2–3 large sweet potatoes, prick all over with a fork, and place on a foil-lined baking sheet. Roast until very tender and the skins are slightly wrinkled, 50–60 minutes; the centers should register around 205°F (96°C). Cool until handleable, peel, and mash until smooth. Measure 3 cups (660 g). If the mash seems watery, heat it in a skillet over medium heat for 3–5 minutes to steam off excess moisture, then cool.

Step 2: Prepare the pan and make the graham crust

Reduce the oven to 350°F (175°C). Line a 9×13-inch metal baking pan with a parchment sling (two sheets overlapping with overhang on the long sides) and lightly grease any exposed sides. In a bowl, combine graham crumbs, brown sugar, salt, and cinnamon. Stir in melted butter until the mixture resembles damp sand. Press firmly and evenly into the pan (use the bottom of a measuring cup). Bake 10 minutes; set aside while you make the filling.

Step 3: Mix the sweet potato filling

In a large bowl, whisk mashed sweet potato, eggs, evaporated milk, melted butter, brown sugar, granulated sugar, cornstarch, vanilla, cinnamon, ginger, nutmeg, cloves, and salt until silky-smooth. For an ultra-smooth texture, blend with an immersion blender for 20–30 seconds. Pour the filling over the warm crust and smooth the top.

Step 4: Bake and cool

Bake at 350°F (175°C) for 25–30 minutes, until the edges are set and the center has a slight wobble. An instant-read thermometer inserted in the center should read 175–180°F (79–82°C). Cool on a rack for 1 hour, then chill until cold and set, 45–60 minutes. This ensures clean slices and keeps the meringue from melting on contact.

Step 5: Whip the marshmallow meringue

Bring 1 inch of water to a simmer in a saucepan. In the bowl of a stand mixer (or a heatproof bowl), whisk together egg whites, sugar, corn syrup, cream of tartar, and a pinch of salt. Set over the simmering water and whisk constantly until the mixture reaches 160°F (71°C), 3–5 minutes, and the sugar is dissolved. Transfer to the mixer and beat on high until stiff, glossy peaks form, 5–7 minutes. Beat in vanilla.

Step 6: Top, toast, and dust

Spread or pipe the meringue generously over the chilled bars, piling it higher in swoops and peaks. Toast with a kitchen torch until the tips are caramelized and golden. No torch? Place under a preheated broiler on the top rack and watch constantly, 20–60 seconds, rotating for even color. For the pecan dust, pulse toasted pecans with powdered sugar and flaky salt in a mini processor until sandy; sprinkle a light veil over the toasted meringue.

Step 7: Slice and serve

Chill 15–20 minutes to set the meringue. Lift the slab out using the parchment sling. Warm a sharp knife under hot water, wipe dry, and cut into 16 bars, wiping the blade between cuts. Serve cool or at room temperature.

Pro Tips

• Weigh or tightly pack the mashed sweet potato for consistent results; excess moisture can cause a soft set.
• Use a metal pan for the crispest crust. If using glass, add 2–3 minutes to the crust bake.
• For extra-smooth filling, strain the sweet potato puree through a fine mesh sieve or blend briefly.
• Swiss meringue stability depends on temperature—heat to 160°F (71°C) and whip to stiff peaks before spreading.
• When broiling the meringue, keep the oven door cracked and never walk away—color develops fast.

Variations

• Maple-Pecan: Replace 1/4 cup (50 g) granulated sugar in the filling with 1/4 cup (60 ml) pure maple syrup and reduce evaporated milk by 2 tbsp. Add 1/2 cup chopped toasted pecans over the crust before the filling.
• Chocolate Barrier: Brush 4 oz (115 g) melted dark chocolate over the baked crust; chill 5 minutes to set, then add filling. Adds a subtle snap and moisture barrier.
• Gluten-Free: Use gluten-free graham crackers or almond flour crumbs (2 cups) and increase melted butter to 8 tbsp (113 g) for binding.

Storage & Make-Ahead

Refrigerate bars (covered) for up to 3 days. The Swiss meringue holds well for 24–48 hours; for the best texture, toast just before serving. To make ahead, bake crust and filling up to 2 days in advance, chill, then top with meringue and toast the day of serving. Freeze (without meringue) for up to 2 months; thaw overnight in the fridge, then add meringue and finish.

Nutrition (per serving)

Approximate per bar: 310 calories; 12 g fat; 46 g carbohydrates; 5 g protein; 1.5 g fiber; 210 mg sodium. Values will vary based on brands and exact portion size.