Rhubarb Custard Bars Recipe

A soft custard tucked over a buttery crust, with little bursts of tart rhubarb and a barely sweet cream layer on top – it disappears faster than expected.

I don’t wait for the oven to fully preheat anymore. I know, that’s not great advice. But when I’m already halfway through mixing something and butter is melting faster than I planned, I just go for it. That’s exactly how these rhubarb custard bars usually start in my kitchen – slightly rushed, a little uneven, but somehow they come out right anyway.

The thing about rhubarb is it doesn’t try to be sweet. It kind of demands that you pay attention. You can’t just dump sugar and hope for magic. These bars are where it finally behaves though. Soft custard, crumbly crust, tangy bits that poke through. It works. It really works.

A quick moment before I started

I almost didn’t make these. The rhubarb I had looked… tired. Slightly limp, not that bright pink anymore. I stood there debating if I should just toss it into something else or chop it up for jam later. But I hate wasting ingredients, so I trimmed the edges, peeled one stubborn stalk, and kept going.

Turns out, slightly older rhubarb still works here. Maybe even better. It softens more, melts into the custard instead of staying super sharp.

Ingredients I Used for the Recipe

• 2 cups all-purpose flour – base for that crumbly crust
• 1/3 cup sugar – just enough sweetness for the crust
• 1 cup salted butter – cold, cubed, gives richness and structure
• 1 1/2 cups sugar – balances the tart rhubarb in the filling
• 1/2 cup flour – thickens the custard slightly
• 1 cup half and half – makes the custard creamy but not too heavy
• 3 eggs – helps everything set properly
• 1 teaspoon vanilla extract – soft background flavor
• 5 cups rhubarb, chopped – the star, tart and juicy
• 6 ounces cream cheese – softened, for the topping
• 1 1/2 cups powdered sugar – smooth sweetness for frosting
• 1 teaspoon vanilla – rounds out the topping
• 1 cup whipped topping – lightens the frosting so it’s not dense

How to make Rhubarb Custard Bars?

Step 1 – Start with the crust

I mix flour and sugar in a big bowl, then toss in the butter. I don’t use a pastry cutter every time. Sometimes just my fingers. It gets messy, butter softens too fast, and I always wonder if I’ve overworked it. The mixture should look crumbly. Mine usually has a few bigger chunks and I leave them.

Step 2 – Press and bake

Press that crumb mix into a lined pan. I never get the corners perfectly even. Bake it for about 10 minutes. The edges barely turn golden, but that’s enough. One time I baked it too long and it got hard. Still edible, just not great.

Step 3 – Prep the rhubarb

Chop into small pieces. Around half-inch-ish. Not precise. If there’s extra moisture, I pat it dry with a paper towel. I forgot this once and the filling came out slightly watery in the center.

Step 4 – Make the custard

Whisk sugar, flour, half and half, eggs, and vanilla. I try not to rush this part. If the eggs aren’t fully mixed, you’ll see streaks later and it looks weird. Then stir in the rhubarb. It looks like too much rhubarb. It’s not.

Step 5 – Bake again

Pour the filling over the crust and bake. Somewhere between 40 and 50 minutes. I always start checking early because ovens lie. The center should jiggle just slightly. If it sloshes, it’s not ready. If it’s stiff, you might have gone too far.

Step 6 – Let it cool properly

This is the hardest part. If you rush it, everything falls apart when you cut. I’ve done that. Warm custard bars are tasty but messy in a bad way.

Step 7 – Make the topping

Beat cream cheese, powdered sugar, and vanilla until smooth. If the cream cheese isn’t soft, it stays lumpy forever. I’ve tried fixing it. Doesn’t work well. Then fold in whipped topping. Don’t stir aggressively or it goes flat.

Step 8 – Finish and chill

Spread the topping over cooled bars and refrigerate. They firm up nicely after a couple hours. Cutting them clean is oddly satisfying.

Something that almost ruined it

I once forgot the flour in the custard. Completely. It baked up looking fine on top, but underneath it was basically sweet scrambled eggs with rhubarb. Not good. I tried chilling it to fix the texture. Didn’t help.

Now I double-check before pouring. It’s one of those tiny steps that feels unnecessary until it’s very necessary.

What it actually tastes like

The first bite is always a mix of things. You get the soft, creamy top layer first. Then the custard, which is lightly sweet but not heavy. And then the rhubarb hits. Tangy, slightly sharp, but mellowed enough that it doesn’t make your face scrunch up.

The crust holds everything together but stays a little crumbly. Sometimes too crumbly if I didn’t press it firmly. I don’t mind that. It feels less perfect, more homemade.

Cold from the fridge, they’re firm and neat. Left out for a bit, they soften and taste richer. I go back and forth on which I like more.

Tips

• Don’t skip draining thawed rhubarb if using frozen – extra water will mess with the texture
• Use softened cream cheese – cold cream cheese = lumpy topping
• Check the center before pulling from the oven – slight jiggle is okay, liquid is not
• Line your pan with parchment – makes lifting and cutting easier
• Chill before slicing – warm bars won’t hold shape
• If crust feels too dry while mixing, press it anyway – it usually comes together while baking

Wanna know one of my favorite things about spring? It’s rhubarb season. And honestly, this is the one recipe I keep coming back to, even when I plan to try something new. There’s just something about that mix of tart and creamy that feels right every time.

Even when I mess up a little.

Print Recipe

Rhubarb Custard Bars Recipe

Author: Kelsey Perez Cooking Method: Baking Cuisine: American Courses: Dessert

Difficulty: easy Prep Time 20 mins Cook Time 50 mins Rest Time 60 mins Total Time 2 hrs 10 mins

Cooking Temp: 350  F Servings: 24 Estimated Cost: $ 8 Calories: 285

Best Season: Spring

Description

Celebrate the arrival of spring with these delightful Rhubarb Custard Bars, also known as Rhubarb Dream Bars. This classic dessert features a buttery shortbread crust, a tangy and creamy custard filling loaded with fresh rhubarb, and is topped with a luscious cream cheese frosting. It's the perfect balance of sweet and tart, making it an ideal treat for potlucks, parties, or just because you love rhubarb!

Ingredients

Servings

Shortbread Crust

• 2 cups all-purpose flour
• ¹⁄₃ cup granulated sugar
• 1 cup salted butter, cold and cubed

Rhubarb Custard Filling

• 1.5 cups granulated sugar
• 0.5 cup all-purpose flour
• 1 cup half-and-half (whole milk can be substituted)
• 3 large eggs
• 1 teaspoon vanilla extract
• 5 cups rhubarb, diced into 1/2-inch pieces (fresh or frozen (thawed and drained))

Cream Cheese Frosting

• 6 oz cream cheese, softened
• 1.5 cups powdered sugar
• 1 teaspoon vanilla extract
• 1 cup whipped topping (such as Cool Whip, thawed)

Instructions

1. Prepare the Pan and Oven

   Preheat your oven to 350°F (175°C). Line a 9x13-inch baking pan with parchment paper, leaving an overhang on the sides for easy removal, or grease the pan lightly with cooking spray.

2. Make the Shortbread Crust

   In a large mixing bowl, combine 2 cups of flour and 1/3 cup of sugar. Cut in the cold cubed butter using a pastry blender, fork, or your fingers until the mixture resembles coarse crumbs. Press the mixture firmly and evenly into the bottom of the prepared pan. Bake for 10 minutes until lightly golden. Remove from oven and set aside.

3. Prepare the Custard Filling

   While the crust bakes, prepare the filling. In a separate large bowl, whisk together 1.5 cups sugar, 1/2 cup flour, half-and-half, eggs, and 1 teaspoon vanilla until smooth and well combined. Gently stir in the diced rhubarb.

4. Bake the Bars

   Pour the rhubarb custard mixture over the warm pre-baked crust. Return the pan to the oven and bake for 40-50 minutes, or until the filling is set and the edges are golden brown. The center should still have a slight jiggle but not be liquid.

5. Cool Completely

   Remove the pan from the oven and place it on a wire rack. Allow the bars to cool completely to room temperature. For best results, refrigerate for at least 1 hour before frosting to ensure the custard is fully set.

6. Make the Frosting and Assemble

   In a medium bowl, beat the softened cream cheese, powdered sugar, and 1 teaspoon vanilla until smooth and creamy. Gently fold in the whipped topping until combined. Spread the frosting evenly over the cooled bars. Refrigerate for at least 30 minutes before cutting into squares. Store leftovers in the refrigerator.

Nutrition Facts

Servings 24

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Amount Per Serving

Calories 285kcal

% Daily Value *

Total Fat 12g19%

Saturated Fat 7g35%

Trans Fat 0.3g

Cholesterol 45mg15%

Sodium 105mg5%

Potassium 180mg6%

Total Carbohydrate 42g15%

Dietary Fiber 1g4%

Sugars 28g

Protein 3g6%

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* Percent Daily Values are based on a 2,000 calorie diet. Your daily value may be higher or lower depending on your calorie needs.

Note

For frozen rhubarb, thaw completely and drain excess liquid thoroughly to prevent a soggy filling. Do not freeze the finished bars as the texture of the custard and frosting will change upon thawing.

Keywords: rhubarb bars, custard bars, spring desserts, rhubarb recipes, easy bar cookies