Classic Buttermilk Slab Pie Recipe made with pie crust, butter, sugar, eggs, buttermilk, vanilla, flour, and nutmeg baked into a rich Southern custard pie.

A cozy Southern custard pie baked in a sheet pan — because sometimes one pie just… isn’t going to cut it.

I’ll tell you something funny about the first time I made this Buttermilk Slab Pie Recipe. I didn’t actually plan on making it. Not really. It started with one of those lazy Sunday afternoons where you wander into the kitchen just to make coffee… and somehow three hours later there’s flour on the counter and you’re baking something.

Sound familiar?

I had a craving for old-fashioned buttermilk pie — the kind that shows up at Southern church dinners or potlucks where someone’s aunt always brings the best dessert in the room. But the twist was… I needed something bigger. A regular pie feeds maybe eight people if everyone behaves. In my family? Eight slices disappear before dinner even starts.

So I thought, What if I just make a bigger one?

That’s how I ended up trying a Buttermilk Slab Pie Recipe instead of a traditional pie.

And honestly? I’m not sure I’ll ever go back.

When it baked, the whole house smelled like warm butter, vanilla, and sugar caramelizing around the edges. The kind of smell that makes people casually wander through the kitchen like, “Oh hey… what are you making?”

You already know what happens next.

We cut into the slab pie while it was still just a little warm (yes, I know, you’re supposed to let it cool completely… but patience is not always my strong suit). The filling was smooth and custardy, with that delicate nutmeg dusting on top.

Someone took a bite and said, “This tastes like grandma’s pie.”

Honestly? That might be the highest compliment a Buttermilk Slab Pie can get.

Have you ever had a dessert that instantly felt nostalgic like that?

Why you’ll Love this Buttermilk Slab Pie Recipe?

There are a lot of pie recipes out there, but this Buttermilk Slab Pie Recipe has something special going for it.

First — it feeds a crowd. And not in a stressful way. One large slab pie baked in a sheet pan gives you neat little squares that are easy to serve at parties, holidays, or those chaotic family gatherings where everyone shows up hungry.

But the real reason people love this Southern buttermilk slab pie is the filling.

Buttermilk pie has this beautiful custard texture that’s silky but still rich. When it bakes, the top forms this lightly golden layer while the inside stays smooth and creamy.

It’s almost like custard pie met cheesecake… but decided to stay a little lighter.

And the flavor? Sweet, buttery, slightly tangy from the buttermilk, and finished with that cozy sprinkle of nutmeg.

Honestly, the more I bake this Buttermilk Slab Pie Recipe, the more I appreciate how simple it is. No complicated steps. No fancy equipment. Just classic ingredients working together.

Which — if you ask me — is how the best recipes usually work.

Ingredient Notes

The ingredient list for this Buttermilk Slab Pie Recipe is surprisingly simple. In fact, there’s a good chance you already have most of these ingredients sitting in your kitchen right now.

• Pie Crust – You’ll need two unbaked pie crusts for the base. Store-bought works perfectly well, especially since they’ll be rolled together into one large sheet.
• Flour – Flour helps thicken the custard filling slightly so it sets properly during baking.
• Granulated Sugar – Sugar provides sweetness and helps form the slightly caramelized surface on top of the pie.
• Buttermilk – Buttermilk is the heart of this Buttermilk Slab Pie Recipe. It adds a gentle tang that keeps the filling balanced instead of overly sweet.
• Butter – Softened butter gives the filling richness and helps create that silky texture.
• Eggs – Eggs help the custard set as the pie bakes.
• Vanilla Extract – Vanilla adds warmth and depth to the flavor.
• Salt – A small pinch of salt balances the sweetness.
• Nutmeg – Freshly grated or ground nutmeg adds that subtle cozy spice that makes the pie smell incredible.

Sometimes the simplest ingredients really do create the best desserts.

How to Make Buttermilk Slab Pie Recipe?

Making this Buttermilk Slab Pie Recipe might look impressive when it’s finished, but the process itself is refreshingly simple.

Step 1: Preheat the Oven

Start by preheating your oven to 350°F.

Grab a 10×15-inch rimmed baking sheet (also called a jelly roll pan). This is what gives the pie its slab shape.

Step 2: Roll the Pie Crust

If you’re using store-bought crust, let it soften according to the package instructions.

On a lightly floured surface, stack the two pie crusts and roll them into a rectangle roughly 12×17 inches.

Transfer the dough into the baking sheet and press it gently into the corners and up the sides of the pan. Trim or fold the edges and crimp them however you like.

Rustic edges are totally fine here.

Step 3: Make the Filling

In a large bowl, beat together the butter and sugar using an electric mixer until the mixture becomes light and fluffy.

Add the flour and eggs, mixing until everything is combined.

Step 4: Add the Buttermilk

Pour in the buttermilk, salt, and vanilla extract, then mix again until the filling becomes smooth.

At this stage the mixture will look fairly thin. That’s normal for a custard-style pie.

Step 5: Fill the Crust

Pour the filling into the prepared crust.

Depending on your pan, you might have a little extra filling. Just fill the crust up to the top edge of the baking sheet.

Sprinkle the surface evenly with nutmeg.

Step 6: Bake the Pie

Bake the slab pie for 35–40 minutes.

The top will turn lightly golden and the center will still have a slight jiggle. That’s actually a good sign — the custard will finish setting as it cools.

Step 7: Cool Before Serving

Let the pie cool completely for at least one hour before slicing.

I know, waiting for pie is difficult. But letting it cool helps the custard firm up so the slices hold together.

Storage Options

If you end up with leftovers from this Buttermilk Slab Pie Recipe, they store really well.

Cover the pie and refrigerate it for 3 to 4 days.

Some people actually prefer buttermilk pie chilled because the texture becomes slightly firmer — almost like cheesecake.

Personally, I’ll eat it either way.

Warm slice. Cold slice. Midnight fridge snack. All acceptable options.

Variations & Substitutions

One thing I love about this Buttermilk Slab Pie Recipe is how easy it is to customize.

• Lemon Buttermilk Slab Pie – Add lemon zest or extra lemon juice to brighten the flavor.
• Coconut Buttermilk Pie – Mix shredded coconut into the filling for added texture.
• Bourbon Buttermilk Pie – A splash of bourbon adds warmth and a little Southern flair.
• Brown Sugar Buttermilk Pie – Swap some of the sugar for brown sugar for deeper caramel notes.

Sometimes the best recipe discoveries happen when you experiment a little.

What to Serve With Buttermilk Slab Pie?

A slice of Buttermilk Slab Pie is wonderful all by itself, but a few simple pairings make it even better.

• Fresh Berries – Strawberries or raspberries add brightness to the rich custard.
• Whipped Cream – A soft cloud of whipped cream is always welcome.
• Vanilla Ice Cream – Warm pie with melting vanilla ice cream is pretty hard to beat.
• Coffee or Tea – A slice of buttermilk slab pie pairs beautifully with a hot cup of coffee or tea.

FAQ

What is Buttermilk Slab Pie?

Buttermilk Slab Pie is a large sheet-pan version of the traditional Southern buttermilk pie, featuring a sweet custard filling baked in a flaky crust.

Why is the center slightly jiggly after baking?

That small jiggle is normal. The custard continues to set as the pie cools.

Does buttermilk slab pie need refrigeration?

Yes. Because the filling contains eggs and dairy, it should be refrigerated if stored longer than a few hours.

There’s something really comforting about a big pan of Buttermilk Slab Pie Recipe sitting on the table. It feels generous, welcoming — like the kind of dessert meant to be shared.

And honestly, those are usually the best kinds of desserts.

So now I’m curious… if you made this Buttermilk Slab Pie, would you serve it warm with ice cream, or cold straight from the fridge?

Either way, I’d love to hear how it turns out.