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Gluten-Free Key Lime Pie Recipe: Zesty, Creamy, Perfect Slice

Two slices of the best key lime pie on plates with a bite taken out of them. An angled, close up shot. The pie plate with the remaining pie is in the background.. There are dollops of whipped cream, and slices of lime decorating the pie.

Who else wants a cold slice of key lime pie?

My birthday is in two days, and I hope you’ll celebrate with me by making this key lime pie. It’s truly birthday-worthy.

This pie is creamy, bright and citrusy with the perfect tart-to-sweet balance. A crumbly graham-style crust made from oats and almonds supports a light lime filling finished with homemade whipped cream — a refreshing, classic summertime dessert.

I fell in love with key lime pie early on during annual family trips to Sanibel Island, Florida. We always finished meals at Gramma Dot’s by sharing slices of key lime pie, and that tradition shaped my taste for this dessert.

What is key lime pie?

Key lime pie is a tangy, creamy pie flavored with key limes. It’s typically made with a graham cracker crust and topped with whipped cream, though some versions are crustless. The pie is known for its refreshing citrus flavor and smooth texture.

What are key limes?

Key limes are small, thin-rinded citrus fruits related to the more common Persian limes. They have a more floral, tart flavor and historically grew throughout the Florida Keys. Because they’re delicate and perishable, key limes can be harder to find in northern regions.

Key lime pie has long been associated with Florida.

Overhead ingredient shot for key lime pie - limes, cream cheese, almonds, oats, butter, sugar, cream, Greek yogurt.

Ingredients for the best key lime pie

The full recipe with exact measurements appears below in the ingredients list, but here’s an overview of what you’ll need.

Gluten-free crust

  • Rolled oats – the base of the crust that lends a light, cookie-like texture.
  • Raw almonds – add a nutty depth to mimic graham cracker flavor.
  • Kosher salt – balances the sweetness.
  • Cinnamon – just a hint to echo graham cracker notes.
  • Brown sugar or coconut sugar – for that molasses-like sweetness.
  • Unsalted butter, melted – binds the crumbs and gives the buttery finish.

Blended together and baked, oats and almonds create a crumb that closely resembles a graham cracker crust while being naturally gluten free and higher in fiber and protein.

Key lime pie filling

  • Lime or key lime zest – essential for bright flavor.
  • Granulated sugar – sweetens the filling; rubbed with zest to release oils.
  • Freshly squeezed lime juice – use fresh key or Persian limes; avoid bottled juice.
  • Unflavored gelatin – a small amount helps the filling set without baking.
  • Heavy whipping cream – whipped for lightness and aeration.
  • Full-fat cream cheese – adds richness without turning the pie into cheesecake.
  • Non-fat plain Greek yogurt – lightens the filling and adds tang.
  • Pure vanilla extract – rounds the flavor.

For topping

  • Homemade whipped cream – strongly recommended for the best flavor and texture.
  • Extra lime slices – for garnish.

Overhead shot of oats, almonds, brown sugar, and cinnamon in blender - ingredients for a crust.

Is this a traditional key lime pie?

No. Traditional recipes often use sweetened condensed milk and eggs and are baked to set. I created a no-bake filling (the crust is baked) that captures the classic flavor without condensed milk. The filling relies on whipped cream, cream cheese, and Greek yogurt for texture, with gelatin for structure.

Overhead shot of crust ingredients blended into a fine meal.

Key limes vs Persian limes

I used Persian limes in these photos because key limes can be difficult to source where I live. Persian limes work beautifully and are easier to zest and juice. True key limes are more floral and tarter, but they require far more labor because they’re so small. If you can get fresh key limes, use them; otherwise, fresh Persian limes are an excellent choice. Avoid bottled lime juices for best flavor.

Overhead shot of crust blended in a blender, with butter.

Does this crust taste like graham cracker?

Yes. The oat-and-almond crust closely mimics the flavor and texture of a graham cracker crust while remaining gluten free. I test-baked this version for family and everyone loved it. If you prefer, you can swap in a traditional graham cracker crust or a store-bought gluten-free graham pie shell — just watch the shell size so the filling fits properly.

Pecans or walnuts can substitute for almonds, but almonds give the closest graham-like flavor.

Overhead shot of gluten free graham cracker crust in a pie plate, with squeezed limes in the background.

Can I freeze this pie?

No. Because the filling contains gelatin, freezing can cause the texture to break and the filling to weep. The pie keeps well in the refrigerator for 4 to 5 days, so it’s easy to make ahead.

Sugar and lime zest rubbed together in a bowl to make lime sugar. Juiced, and zested limes are in the background, on a cutting board.

Top with homemade whipped cream

Freshly made whipped cream is essential. It only takes minutes and elevates the pie. You can pipe rosettes, spoon dollops, or serve whipped cream on the side. If piping, a little powdered sugar helps stabilize the cream so decorations hold their shape.

Key lime pie filling in a mixing bowl with mixing beaters hovering above it. Juiced, and zested limes are in the background on a cutting board.

This recipe means a lot to me — key lime pie is a nostalgic favorite and one of my top five pies. It made my parents’ day to enjoy gluten-free slices again, and family members have declared this version “the best” I’ve ever made.

Overhead shot of the best key lime pie with rosettes of whipped cream decorating the outside, and lime slices on every other rosette. There are plain plates, a pie server, and forks in the background.

Why you’ll love this key lime pie

  • Refreshing and citrus-forward
  • Creamy without being heavy
  • Perfect tart-sweet balance
  • Tropical and bright — ideal for summer
  • Gluten free crust option
  • No-bake filling (crust is baked)
  • Easy to assemble
  • Works with regular or key limes
  • Best served with homemade whipped cream

Overhead shot of the best key lime pie. 2 slices of pie have been removed from the pie and are on plates. The remaining pie is in the background with a pie server.

More summertime desserts to try

  • Instant pot cheesecake with cherry topping
  • Healthier scotcharoos without corn syrup
  • Chocolate peanut butter chia pudding
  • Lemon cheesecake cookie cups with berries
  • Gluten-free lemon bars
  • Peanut butter and chocolate puffed rice treats
  • No-bake brownies with chocolate frosting

Overhead shot of the best key lime pie. 2 slices of pie are removed from the pie, and on plates. Bites are taken out of the pies. The remaining pie in the pie plate is the background.

Did you make this recipe?

Tell me how it turned out in the comments and leave a star rating — I love hearing from you.

Description

A creamy, tangy lime filling sits on a crumbly gluten-free crust made from oats and almonds. This version skips sweetened condensed milk, stays mostly no-bake, and makes a bright, refreshing dessert perfect for summer.

Ingredients

Gluten Free Crust

  • 1 cup rolled oats (use certified gluten free if needed)
  • 1 cup raw almonds
  • 1/4 teaspoon kosher salt
  • 1/2 teaspoon cinnamon
  • 3 tablespoons brown sugar or coconut sugar
  • 1/3 cup unsalted butter, melted

Pie Filling

  • 1 tablespoon lime or key lime zest (about 3–4 Persian limes)
  • 1/2 cup granulated sugar
  • 1/2 cup + 2 tablespoons freshly squeezed lime juice
  • 1.5 teaspoons unflavored gelatin
  • 1/2 cup heavy whipping cream
  • 3/4 cup full-fat cream cheese, room temperature
  • 3/4 cup non-fat plain Greek yogurt
  • 1 teaspoon pure vanilla extract

For Topping

  • Homemade whipped cream
  • Extra lime slices for garnish

Instructions

  1. Prepare: Preheat oven to 350°F (175°C).
  2. Make the crust: In a high-powered blender or food processor, combine oats, almonds, salt, cinnamon and brown sugar. Pulse to a fine meal resembling graham crumbs. Keep an eye to avoid turning the nuts into butter. With the machine running, stream in melted butter until the mixture holds together like wet sand. If needed, add an extra tablespoon of butter.
  3. Press into pie plate: Transfer crumbs to a 9-inch pie plate. Press evenly across the bottom and slightly up the sides using a piece of parchment and the bottom of a measuring cup or glass.
  4. Bake the crust: Bake at 350°F for 15 minutes, then increase heat to 375°F and bake an additional 5–10 minutes until golden. Cool completely before filling. To speed cooling, place in the freezer for 10 minutes after resting 15 minutes at room temperature.
  5. Prep the lime sugar: Zest limes until you have 1 tablespoon. Rub the zest into the granulated sugar with your fingers until fragrant and slightly green.
  6. Juice the limes: Juice enough limes to yield 1/2 cup plus 2 tablespoons. Strain through a fine mesh sieve if pulpy and measure after straining.
  7. Bloom the gelatin: Sprinkle gelatin over 3 tablespoons of the lime juice and let soften for 5 minutes.
  8. Dissolve the gelatin: Warm the remaining lime juice slightly, then whisk in the softened gelatin until fully dissolved. Cool the mixture before adding to the filling.
  9. Make the filling: In a large bowl, whip heavy cream until slightly thickened and sugar is dissolved. Add room-temperature cream cheese and beat until combined, then add Greek yogurt and vanilla and mix until smooth. Slowly stream in the cooled lime/gelatin mixture and blend until uniform. Taste and adjust sweetness by adding 1 tablespoon sugar at a time if needed.
  10. Fill the crust: Pour the filling into the cooled crust, smoothing the top. You may have a tablespoon or two extra.
  11. Chill: Cover the pie (avoid touching the filling) and chill 4–6 hours or overnight until set.
  12. Decorate and serve: Top with homemade whipped cream and lime slices before serving. Slice with a sharp knife and serve. Store covered in the refrigerator for 4–5 days.

Notes

Oats: Buy certified gluten free oats if needed.

Almonds: Pecans or walnuts can substitute, though almonds give the closest graham-like flavor.

Crust options: A traditional graham cracker crust or pre-made gluten-free shell can be used; be mindful of shell size.

Limes: Fresh limes (Persian or key) are best. Key limes are more tart and floral but require many more to yield the same juice. Avoid bottled lime juice.

Greek yogurt: Use true Greek yogurt (strained) for thickness — brands like Fage or Stonyfield work well.

Whipped cream: If piping whipped cream, use powdered sugar to help stabilize the peaks.

Did you make this recipe?

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