Welcome the season of spring with these delightful Rhubarb Cheesecake Squares with Oat Crumble. The tartness of fresh rhubarb perfectly balances the creamy, rich cheesecake filling, all nestled atop a buttery oat crust. These squares are guaranteed to become a favorite for potlucks, holidays, or just a cozy afternoon treat.

Why You Will Love This Recipe

These Rhubarb Cheesecake Squares with Oat Crumble offer a fantastic textural contrast that elevates a simple dessert. You get the satisfying crunch and chewiness from the spiced oat crumble base and topping, a smooth, tangy layer of classic cheesecake, and bright bursts of tender, slightly tart rhubarb.

They are much easier to serve than a traditional round cheesecake, making them ideal for gatherings—just slice and enjoy! Furthermore, this recipe provides the perfect way to utilize beautiful seasonal rhubarb harvests in a way that appeals to both crumble lovers and cheesecake aficionados.

Ingredients

• 1 1/2 cups all-purpose flour
• 1 cup rolled oats (not instant)
• 1/2 cup packed light brown sugar
• 1/2 teaspoon ground cinnamon
• 1/4 teaspoon salt
• 1/2 cup (1 stick) cold unsalted butter, cut into small cubes
• 16 ounces cream cheese, softened to room temperature
• 1/2 cup granulated sugar
• 1 large egg
• 1 teaspoon vanilla extract
• 2 cups chopped fresh or frozen rhubarb (thawed and drained slightly if frozen)
• 1 tablespoon all-purpose flour (for tossing with rhubarb)
• 1 tablespoon fresh lemon juice

Step-by-Step Instructions

1. Preheat your oven to 350°F (175°C). Grease and line an 8×8 inch baking pan with parchment paper, leaving an overhang on two sides for easy removal later.
2. Prepare the crumble base: In a medium bowl, whisk together the 1 1/2 cups flour, rolled oats, brown sugar, cinnamon, and salt. Cut in the cold butter using a pastry blender or your fingertips until the mixture resembles coarse crumbs.
3. Press about two-thirds (2/3) of the crumble mixture firmly into the bottom of the prepared baking pan to form the crust. Reserve the remaining one-third (1/3) for the topping.
4. Bake the crust for 10 minutes, or until lightly golden brown. Remove from the oven and set aside while preparing the filling.
5. Prepare the cheesecake filling: In a large bowl, beat the softened cream cheese and granulated sugar with an electric mixer until smooth and creamy, ensuring no lumps remain. Beat in the egg and vanilla extract until just combined. Do not overmix.
6. Prepare the rhubarb: In a small bowl, gently toss the chopped rhubarb with 1 tablespoon of flour and the lemon juice. The flour helps absorb some of the moisture released during baking.
7. Spread the cream cheese filling evenly over the pre-baked crust. Spoon the prepared rhubarb pieces randomly over the cheesecake layer.
8. Sprinkle the reserved crumble mixture evenly over the top of the rhubarb layer.
9. Bake for 40 to 45 minutes, or until the edges are set and the center has only a slight wobble.
10. Let the Rhubarb Cheesecake Squares with Oat Crumble cool completely on a wire rack before chilling. Cooling for at least 2 hours in the refrigerator before slicing is crucial for clean cuts.
11. Once chilled, use the parchment paper overhang to lift the dessert from the pan, then slice into 16 squares.

Expert Tips / Pro Tips

• Use room temperature cream cheese: This is non-negotiable for a smooth, lump-free cheesecake filling. If your cream cheese is cold, the filling will be lumpy.
• Chill thoroughly: Patience rewards you here. If you try to slice the squares while warm or only slightly cooled, the filling will ooze out. A minimum of 4 hours, or preferably overnight, in the refrigerator yields the best clean slices.
• Don’t overmix the filling: Once the egg is added, mix only until streaks disappear. Overmixing incorporates too much air, which can cause the cheesecake to puff up during baking and crack upon cooling.
• Prevent wet rhubarb: If your fresh rhubarb is very watery, or if using frozen rhubarb, pat it dry with paper towels after tossing it with the flour and lemon juice to prevent a soggy bottom layer.

Variations & Substitutions

• Other Berries: Feel free to substitute half the rhubarb with strawberries (a classic pairing) or raspberries for added sweetness and color.
• Gluten-Free Option: Substitute the all-purpose flour in the base/topping with a high-quality 1-to-1 gluten-free blend. Ensure your oats are certified gluten-free.
• Spice Swap: Instead of cinnamon, try adding a pinch of ground cardamom or nutmeg to the oat crumble mixture for a warmer flavor profile.
• Nutty Crunch: Add 1/4 cup of chopped pecans or slivered almonds to the reserved crumble topping before sprinkling it on the squares.

Serving Suggestions

These Rhubarb Cheesecake Squares with Oat Crumble are wonderful served cold directly from the refrigerator. For an extra decadent experience, try serving them slightly warmed (microwave for 10-15 seconds) topped with a dollop of:

• Freshly whipped cream (lightly sweetened with vanilla).
• A scoop of high-quality vanilla bean ice cream.
• A drizzle of caramel sauce for contrast.

Storage, Freezing & Reheating

Storage: Store leftover Rhubarb Cheesecake Squares tightly covered in the refrigerator. They maintain optimal freshness for up to 4 days.

Freezing: These squares freeze exceptionally well. Place the cooled, unsliced baked squares in a single layer in a freezer-safe container lined with parchment paper. Cover tightly with plastic wrap followed by foil. Freeze for up to 2 months. Thaw overnight in the refrigerator before slicing and serving.

Reheating: If serving from frozen or chilled, allow them to come to room temperature for about 30 minutes before slicing. If you prefer a warm treat, warm individual slices briefly (10-15 seconds) in the microwave.

Nutrition Information

Note: Nutritional values are approximate and based on standard ingredient databases. Calculations are for one square (assuming 16 squares per 8×8 pan). Actual values will vary based on specific ingredient brands and serving size.

FAQ

Can I use frozen rhubarb instead of fresh?

Yes, frozen rhubarb works well in this recipe. You will need to thaw it completely before use and gently pat it dry to remove excess moisture, as frozen fruit releases more water during baking.

How do I get perfectly clean slices of cheesecake?

The secret is chilling! Ensure the squares are completely cooled to room temperature, then chill them in the refrigerator for a minimum of 4 hours, or preferably overnight. Use a long, sharp knife, wiping it clean between each cut.

What size pan should I use for this recipe?

This recipe is perfectly scaled for an 8×8 inch square baking pan. Using a larger pan (like 9×13) will result in very thin, underbaked bars.

Can I leave out the rhubarb?

You can, but you will miss the signature flavor! If you omit the rhubarb, you should replace it with an extra 1/2 cup of the cheesecake batter on top, or simply sprinkle the remaining crumble mixture over the whole filling layer, adjusting the baking time slightly if necessary.

Rhubarb Cheesecake Squares with Oat Crumble

Tangy rhubarb baked over a creamy cheesecake layer, topped with a buttery, crisp oat crumble. A perfect balance of tart and sweet.

Print Recipe Pin Recipe

Prep Time 30 minutes mins

Cook Time 55 minutes mins

Total Time 1 hour hr 25 minutes mins

Servings: 12 squares

Course: Baking, Dessert

Cuisine: American

Calories: 380

Ingredients Method Notes

Ingredients

  

Oat Crumble Topping

• 1 cup All-purpose flour
• 1 cup Rolled oats
• 1/2 cup Light brown sugar, packed
• 1/2 cup Unsalted butter, cold and cubed
• 1/2 teaspoon Ground cinnamon

Rhubarb Filling

• 3 cups Fresh or frozen rhubarb, chopped (approx. 1 inch pieces)
• 1/2 cup Granulated sugar
• 2 tablespoons Cornstarch
• 1 tablespoon Lemon juice

Cheesecake Layer

• 16 ounces Cream cheese, softened
• 1/2 cup Granulated sugar
• 2 large Eggs
• 1 teaspoon Vanilla extract

Crust Base

• 1 1/2 cups Graham cracker crumbs
• 1/4 cup Granulated sugar
• 6 tablespoons Unsalted butter, melted

Method

 

Instructions

1. Preheat oven to 350°F (175°C). Grease and line a 9×13 inch baking pan with parchment paper, leaving an overhang for easy removal.
2. Prepare the crust: Mix graham cracker crumbs, 1/4 cup sugar, and melted butter until combined. Press firmly into the bottom of the prepared pan and bake for 10 minutes. Set aside to cool slightly.
3. Prepare the rhubarb filling: In a medium bowl, toss the chopped rhubarb with 1/2 cup sugar, cornstarch, and lemon juice. Set aside.
4. Prepare the cheesecake layer: Beat the softened cream cheese and 1/2 cup sugar until smooth. Beat in the eggs one at a time, then stir in the vanilla extract. Pour the cream cheese mixture evenly over the slightly cooled crust.
5. Layer and top: Gently spoon the rhubarb mixture over the cheesecake layer. In a separate bowl, combine all oat crumble ingredients until a coarse, crumbly texture forms. Sprinkle the oat crumble evenly over the rhubarb.
6. Bake for 45 to 55 minutes, or until the topping is golden brown and the cheesecake is mostly set (a slight jiggle in the center is fine). Cool completely on a wire rack, then chill in the refrigerator for at least 4 hours before slicing into squares.

Notes

It is crucial to chill completely before cutting to ensure clean, firm squares. If using frozen rhubarb, do not thaw it beforehand.