Easy Strawberry Rhubarb Custard Bars (No Pie Crust Needed!)

These easy strawberry rhubarb custard bars combine a buttery sugar cookie crust, juicy summer fruit, and a silky homemade custard — all in one 9×13 pan and with zero pie crust drama. If you love the classic flavor of rhubarb custard pie but hate the fussy dough, this is the summer dessert you’ve been waiting for.
These easy strawberry rhubarb custard bars are creamy, fruity, and perfect for summer gatherings, potlucks, and weekend baking.

If you love nostalgic summer desserts, you’ll also love these Lemon Cheesecake Bars and this creamy 2-Ingredient Biscoff Cheesecake.

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Why You’ll Love These Strawberry Rhubarb Custard Bars

These easy strawberry rhubarb custard bars are the perfect mix of creamy, fruity, buttery, and refreshing. If you love classic summer desserts, this recipe checks every box.

Here’s why they’re so good:

• No homemade pie crust required
• Soft buttery sugar cookie base
• Sweet strawberries balance tart rhubarb perfectly
• Rich and silky custard filling
• Easy to make in one pan
• Perfect make-ahead summer dessert
• Great for BBQs, potlucks, and family gatherings

The sugar cookie crust gives these bars a soft, buttery texture that pairs beautifully with the creamy custard and juicy fruit filling. Every bite tastes like summer.

The Best Crust for Easy Strawberry Rhubarb Custard Bars

One of the best parts about these strawberry rhubarb custard bars is how easy the crust is to make. Instead of rolling out traditional pie dough, this recipe uses a simple sugar cookie mix shortcut that saves time while still tasting homemade.

The crust bakes up soft, buttery, and slightly chewy — creating the perfect base for the creamy custard and tart rhubarb filling. It’s sturdy enough to hold the bars together while staying tender and delicious.

All you need is:

• sugar cookie mix
• butter
• flour
• egg

Once mixed, the dough presses directly into the baking pan with no chilling or rolling required.

This easy shortcut makes the recipe approachable for beginner bakers while still delivering bakery-style dessert bars.

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A Family Recipe, Reinvented

Rhubarb custard pie has been a summer staple in my family for as long as I can remember. My mom makes it the moment the rhubarb patch comes alive, with her signature pie crust that cradles the creamy custard just right.

But here’s my confession: I have never enjoyed making pie crust. It’s fiddly, it cracks, and the store-bought versions just don’t deliver. So I built this easy rhubarb dessert that keeps every bit of the flavor I grew up loving — and trades the pie crust for a sweet, buttery sugar cookie base inspired by my Lemon Cheesecake Bars.

The result? A summery, share-worthy dessert that tastes like Mom’s pie but takes a fraction of the effort.

Ingredients You’ll Need

These easy strawberry rhubarb custard bars use simple pantry ingredients and fresh summer fruit to create the perfect sweet and tart dessert.

For the Sugar Cookie Crust

• 1 pouch (17.5 oz) Betty Crocker sugar cookie mix
• ½ cup butter, softened
• 2 tablespoons all-purpose flour
• 1 egg

For the Fruit Layer

• 3 cups rhubarb, chopped into small pieces (fresh or thawed frozen)
• 2 cups strawberries, roughly chopped

For the Custard

• 3 eggs, beaten
• 1 cup granulated sugar
• 1 cup heavy whipping cream
• ¼ cup all-purpose flour
• ½ teaspoon salt

How to Make Easy Strawberry Rhubarb Custard Bars

1. Step 1: Prep the Pan and Crust
   Preheat the oven to 350°F (175°C) and lightly spray a 9×13-inch baking pan with nonstick spray.
   In a medium bowl, mix the sugar cookie mix, softened butter, 2 tablespoons of flour, and 1 egg until a crumbly but pressable dough forms. Press the dough evenly and firmly into the bottom of the prepared pan to form the crust.
2. Step 2: Add the Fruit
   Scatter the chopped rhubarb and strawberries evenly over the crust. If you’re using frozen rhubarb, make sure it’s fully thawed and patted dry — toss it with 1 extra tablespoon of flour if it’s still juicy to prevent a watery custard.
3. Step 3: Make the Custard
   In a medium bowl, whisk together the 3 beaten eggs, granulated sugar, heavy whipping cream, ¼ cup flour, and salt until completely smooth. Pour the custard evenly over the fruit layer, spreading gently with a spatula if needed.
4. Step 4: Bake
   Bake at 350°F for 50 to 60 minutes, or until the edges are set and lightly golden and the center still wobbles just slightly when you nudge the pan. The custard will continue to set as it cools — don’t overbake!
5. Step 5: Cool and Slice
   Let the bars cool completely to room temperature before slicing. For the cleanest squares, chill in the fridge for an hour before cutting.

Pro Tips for the Best Custard Bars

Use fresh rhubarb when you can. Rhubarb is technically a vegetable, but its bright tart flavor is what makes this dessert sing. We have a small rhubarb patch left over from my parents’ garden, and it’s the crown jewel of my summer produce.
According to University of Minnesota Extension, rhubarb thrives in cooler climates and is harvested throughout spring and early summer.

Frozen rhubarb works beautifully — just thaw it completely, drain the liquid, pat it dry, and toss with a tablespoon of flour if it still feels wet. This single step is the difference between creamy custard and a soggy mess.

Trust the wobble. The center should still jiggle slightly when you pull it from the oven. That’s exactly what you want — a perfectly set custard with a creamy (not dry) texture.

Let it cool fully before slicing. I know, the hardest part. But the custard needs time to set up for clean, picture-perfect bars.

Flavor Swaps and Add-Ins

The classic rhubarb custard pie is the inspiration here, but the strawberry rhubarb combination takes it to a whole new level. The strawberries bring a juicy sweetness that softens the rhubarb’s tang and turns these bars into pure summer in a pan.

For more fruity summer desserts, try this refreshing Rhubarb Juice Concentrate or these easy No-Bake Desserts.

Want to mix it up? Try these swaps:

• Lemon zest boost — add 1 teaspoon of lemon zest to the custard for brightness
• Raspberry rhubarb bars — swap the strawberries for fresh raspberries
• Blueberry rhubarb bars — use 2 cups of blueberries instead of strawberries
• Shortbread crust — substitute the sugar cookie mix with a homemade shortbread base
• Add a streusel topping — sprinkle ¼ cup brown sugar mixed with 2 tablespoons butter and ¼ cup oats over the custard before baking

How to Store Strawberry Rhubarb Custard Bars

In the fridge: Store covered in an airtight container for up to 3–4 days. The custard will stay creamy and fresh.
The FDA food storage guidelines recommend refrigerating custard-based desserts promptly after cooling.

In the freezer: Wrap individual bars (or the whole pan) tightly in plastic wrap and foil. They freeze well for up to 2 months. Thaw overnight in the fridge. The custard may be slightly softer after freezing, but the flavor stays delicious.

To reheat: Serve chilled or at room temperature for the best texture. If you prefer them warm, pop a slice in a 300°F oven for 8–12 minutes or microwave in 10–20 second bursts.

These easy strawberry rhubarb custard bars taste even better chilled the next day because the custard becomes extra creamy and firm.

Make-Ahead Tips

These bars are a dream for entertaining because they can be partially prepped in advance:

• Day before: Press the crust into the pan, add the fruit layer, cover, and refrigerate up to 24 hours. The next day, whisk the custard fresh, pour it on, and bake.
• Same day: Bake in the morning and let cool — they’ll be perfectly set by dinnertime.

Need more easy make-ahead treats for gatherings? These easy dessert bars are always crowd favorites.

Frequently Asked Questions

Can I use frozen rhubarb in these bars?

Yes! Thaw the rhubarb fully, drain it, and pat it dry with paper towels. If it still feels wet, toss it with 1 extra tablespoon of flour before adding it to the crust to prevent a runny custard.

Can I make this without sugar cookie mix?

Absolutely. You can substitute homemade sugar cookie dough, a shortbread crust, or even a graham cracker crust. The sugar cookie mix is just the quickest, easiest option.

How do I know when the custard is set?

The edges should be lightly golden and set, while the center still has a slight wobble when you gently shake the pan. The custard firms up as it cools — overbaking will dry it out.

Can I reduce the sugar?

You can cut back by about ¼ cup if your strawberries are extra sweet, but going lower may affect the custard’s structure and texture. The sugar plays a role in helping the custard set properly.

Why Strawberry and Rhubarb Work So Well Together

The sweetness of strawberries perfectly balances rhubarb’s naturally tart flavor. That contrast is why strawberry rhubarb desserts have remained popular for generations, especially in classic summer baking recipes like pies, crisps, cobblers, and custard bars.

Are these bars gluten-free?

Not as written — both the sugar cookie mix and the custard contain flour. You can experiment with gluten-free sugar cookie mix and a 1:1 gluten-free flour blend in the custard for a GF version.

What pan size works best?

A 9×13-inch pan is the sweet spot. A smaller pan will give thicker, longer-baking bars, and a larger one will spread the custard too thin.

How many servings does this recipe make?

This recipe makes about 12 generous servings when cut into squares — perfect for a potluck, family dinner, or weekend gathering.

Can I make easy strawberry rhubarb custard bars ahead of time?

Yes! These easy strawberry rhubarb custard bars are perfect for making a day ahead because the custard sets beautifully overnight in the refrigerator.

Conclusion

These Easy Strawberry Rhubarb Custard Bars are everything a summer dessert should be — creamy, buttery, fruity, and bursting with sweet-tart flavor. The soft sugar cookie crust pairs perfectly with the silky custard filling, while the strawberries and rhubarb create that classic nostalgic flavor everyone loves.

Whether you’re baking for a summer BBQ, family gathering, potluck, or simply using up fresh rhubarb from the garden, these easy strawberry rhubarb custard bars are guaranteed to impress. Best of all, they’re simple to make with everyday ingredients and no complicated pie crust required.

If you love easy summer dessert bars with fresh fruit and creamy custard, this recipe is one you’ll want to make again and again all season long.