This Vibrant Purple Sweet Potato Pie is pure joy in a flaky crust. The color is naturally stunning, and the filling is velvety, gently spiced, and not too sweet. It is the dessert that always gets a second slice request.
I will walk you through every detail so your pie sets perfectly, stays vibrant, and tastes like it came from a cozy bakery.
Vibrant Purple Sweet Potato Pie with Silky Custard
Equipment
- 1 9-inch pie pan
- 1 Baking Sheet
- 1 Parchment Paper
- 1 Pie weights
- 1 Blender or large bowl and whisk
- 1 Fine-mesh sieve (optional)
- 1 Instant-read thermometer (optional)
- 1 Foil for shielding crust edges (optional)
Ingredients
Crust
- 1 9-inch single pie crust chilled in the pan; homemade or store-bought; use gluten-free if needed
- 1 egg white lightly beaten, for sealing blind-baked crust (optional)
Filling
- 2 cup mashed roasted purple sweet potato packed; from 2 to 3 medium Stokes Purple or Okinawan sweet potatoes; do not confuse with ube
- 3 large eggs room temperature
- 0.75 cup light brown sugar packed; or 1/2 cup granulated sugar plus 1/4 cup pure maple syrup
- 1 cup full-fat coconut milk or evaporated milk half-and-half also works; for dairy-free choose coconut milk
- 4 tbsp unsalted butter melted and slightly cooled; for dairy-free use melted coconut oil or vegan butter
- 2 tbsp cornstarch arrowroot works in a pinch
- 1 tsp ground cinnamon
- 0.5 tsp ground ginger
- 0.25 tsp ground nutmeg
- 0.5 tsp fine sea salt
- 1 tsp vanilla extract
- 1 tsp lemon juice or apple cider vinegar helps keep the purple color bright
Garnish (optional)
- Lightly sweetened whipped cream or coconut whip
- Toasted coconut flakes
- Candied pecans
Instructions
Roast the Purple Sweet Potatoes
- Heat oven to 400 a0F. Scrub potatoes, pierce each a few times, and place on a lined sheet. Roast 50 to 70 minutes until very tender when pierced. Cool, peel, and mash. You can roast a day ahead and refrigerate.
Prepare and Blind-Bake the Crust
- Lower oven to 375 a0F. Line the chilled crust with parchment and fill with pie weights. Bake 15 minutes, remove weights and parchment, then bake 5 to 8 minutes more until the bottom looks dry and lightly golden. Brush with egg white to seal, then cool 10 minutes. Reduce oven to 350 a0F for baking the pie.
Blend the Filling Until Silky
- In a blender or large bowl, combine mashed purple sweet potato, eggs, brown sugar, coconut or evaporated milk, melted butter, cornstarch, spices, salt, vanilla, and lemon juice. Blend or whisk until very smooth, avoiding too much air. For extra silkiness, pass through a fine-mesh sieve.
Fill and Bake
- Pour the filling into the warm crust. Bake at 350 a0F for 45 to 55 minutes. The edges should be set and the center should jiggle slightly like gelatin. An instant-read thermometer inserted near the center should read 175 to 180 a0F.
Cool Completely
- Transfer to a rack and cool at least 3 hours before slicing. Cooling sets the custard and preserves the vibrant color. Chill if making ahead.
Garnish and Serve
- Top with whipped cream or coconut whip, a sprinkle of cinnamon, and crunchy pecans if you like. Slice with a warm, dry knife for clean edges.
Notes
Why You’ll Love This Vibrant Purple Sweet Potato Pie
- Silky, custardy texture with warm cinnamon and vanilla.
- All-natural color from purple sweet potatoes, not food dye.
- Make-ahead friendly for holidays and gatherings.
- Easy to customize with dairy-free or gluten-free swaps.
Vibrant Purple Sweet Potato Pie Ingredients & Substitutions
Crust
- 1 9-inch single pie crust, chilled in the pan (homemade or store-bought; all-butter for flavor, shortening for extra flake; use gluten-free crust if needed).
- 1 egg white, lightly beaten, for sealing the crust after blind bake (optional but helps crispness).
Filling
- 2 cups mashed roasted purple sweet potato, packed (about 450 g from 2 to 3 medium Stokes Purple or Okinawan sweet potatoes; do not confuse with ube).
- 3 large eggs, room temperature.
- 3/4 cup light brown sugar, packed (or 1/2 cup granulated sugar plus 1/4 cup pure maple syrup).
- 1 cup full-fat coconut milk or evaporated milk (half-and-half also works; for dairy-free, choose coconut milk).
- 4 tablespoons unsalted butter, melted and slightly cooled (for dairy-free, use melted coconut oil or vegan butter).
- 2 tablespoons cornstarch (sets the custard cleanly; arrowroot works in a pinch).
- 1 teaspoon ground cinnamon.
- 1/2 teaspoon ground ginger.
- 1/4 teaspoon ground nutmeg.
- 1/2 teaspoon fine sea salt.
- 1 teaspoon vanilla extract.
- 1 teaspoon lemon juice or apple cider vinegar (keeps the purple color bright).
Optional garnish: lightly sweetened whipped cream or coconut whip, toasted coconut, or candied pecans.
Step-by-Step Instructions to Make Vibrant Purple Sweet Potato Pie
Roast the Purple Sweet Potatoes
Heat oven to 400 F. Scrub potatoes, pierce each a few times, and place on a lined sheet. Roast 50 to 70 minutes until very tender when pierced. Cool, peel, and mash. You can roast a day ahead and refrigerate.
Prepare and Blind-Bake the Crust
Lower oven to 375 F. Line the chilled crust with parchment and fill with pie weights. Bake 15 minutes, remove weights and parchment, then bake 5 to 8 minutes more until the bottom looks dry and lightly golden. Brush with egg white to seal, then cool 10 minutes. Reduce oven to 350 F for baking the pie.
Blend the Filling Until Silky
In a blender or large bowl, combine mashed purple sweet potato, eggs, brown sugar, coconut or evaporated milk, melted butter, cornstarch, spices, salt, vanilla, and lemon juice. Blend or whisk until very smooth. Avoid whipping in too much air. For extra silkiness, pass through a fine mesh sieve.
Fill and Bake
Pour the filling into the warm crust. Bake at 350 F for 45 to 55 minutes. The edges should be set and the center should jiggle slightly like gelatin. An instant-read thermometer inserted near center should read 175 to 180 F.
Cool Completely
Transfer to a rack and cool at least 3 hours before slicing. Cooling sets the custard and preserves the vibrant color. Chill if making ahead.
Garnish and Serve
Top with whipped cream or coconut whip, a sprinkle of cinnamon, and crunchy pecans if you like. Slice with a warm, dry knife for clean edges.
Tips for Success
- Weigh the puree. Two packed cups is about 450 g for the best set.
- Room temperature ingredients blend smoother and bake more evenly.
- Add a touch of acid. Lemon juice helps keep the purple hue bright.
- Shield the crust. Use a foil ring if edges brown too quickly.
- Do not overbake. Pull the pie when the center still wobbles slightly.
- Let it rest. Cooling fully prevents cracks and watery slices.
- If using coconut milk, shake the can well so the fat is evenly distributed.
Variations of Vibrant Purple Sweet Potato Pie
- Gingersnap Crust: Swap the pastry for a gingersnap crumb crust with melted butter for spicy-sweet crunch.
- Dairy-Free: Use coconut milk and coconut oil or vegan butter, plus coconut whip on top.
- Gluten-Free: Use a certified gluten-free pie crust or a gluten-free cookie crumb crust.
- Maple-Sweetened: Replace brown sugar with 1/2 cup maple syrup and reduce milk by 2 tablespoons.
- Marshmallow or Meringue Topping: Torch just before serving for show-stopping drama.
- Mini Pies: Bake in tart shells 18 to 24 minutes at 350 F until just set.
Serving Suggestions: What to Pair with Vibrant Purple Sweet Potato Pie
- Cinnamon or vanilla bean whipped cream.
- Toasted coconut flakes and candied pecans for texture.
- Vanilla ice cream or coconut gelato.
- Fresh coffee, spiced chai, or a small glass of bourbon or tawny port.
Storage & Reheating Instructions
Refrigerate covered for 3 to 4 days. For longer storage, wrap well and freeze up to 2 months. Thaw overnight in the fridge.
To serve warm, heat slices at 300 F for 8 to 10 minutes. Avoid microwaving if you want to keep the crust crisp.
Memories Made Around the Table
I first baked this pie after spotting Stokes Purple sweet potatoes at our farmer’s market. The kids were convinced I added food coloring, then took a bite and went quiet in the best way. Now it is our festive tradition.
FAQs
Can I use ube instead of purple sweet potato?
Ube is purple yam, not the same as purple sweet potato. You can use frozen grated ube, but the flavor is slightly different and you may need a bit more milk to blend smooth. If using ube extract, reduce sugar slightly since some extracts are sweetened.
Why did my pie turn brown or gray?
Overbaking or an alkaline mixture can dull the color. Bake just until set, add a little lemon juice, and avoid any leaveners like baking soda.
Do I have to blind-bake the crust?
I highly recommend it for a crisp bottom. It prevents a soggy crust and helps the custard bake evenly.
Can I use canned puree?
Canned purple sweet potato puree is rare. If you find it, use 2 cups and warm it slightly before mixing. Canned pumpkin will work texturally, but the color and flavor will change.
How can I prevent cracks?
Do not overmix, do not overbake, and cool slowly. Pull the pie when it still jiggles and avoid drafts while cooling.
Final Thoughts
This Vibrant Purple Sweet Potato Pie is a beautiful twist on a classic, with a custard that slices clean and melts on the tongue. Bake it once and it will become your new holiday signature.