I have made a LOT of crumbles in my life. This is the one I’m making forever now.
Raspberries get tossed with brown sugar, lemon juice, vanilla, and a hit of fresh lemon zest. Then blanketed in a thick, buttery oat topping with a sneaky sprinkle of pumpkin pie spice (yes, pumpkin pie spice. In summer. It’s giving fall and I am not sorry).
The fruit gets jammy and just a little syrupy underneath. The topping bakes up golden and CRUNCHY with those perfect buttery clumps scattered throughout. The kitchen smells like something that should not be legal.
Warm with vanilla ice cream pooling in the cracks. Cold at midnight over the sink with a fork. Both correct. Both gone in 24 hours, max.
Fresh vs. Frozen Raspberries
FRESH raspberries deliver brighter flavor and hold their shape better during baking. FROZEN work beautifully too (no thawing needed… toss them straight from the bag with sugar and cornstarch to prevent a soggy bottom).
Either way, fold gently to avoid crushing the berries and losing all that precious juice. Expect an extra 5 minutes of bake time if using frozen!
How to Get a Crunchy Crumble Topping
- Keep that butter COLD. Cube it while it’s still fridge-firm, then pop it back in the freezer for 5 minutes if your kitchen runs warm!
- Mix dry ingredients first (oats, flour, sugar, spice, salt), then add the butter and work it in with your FINGERTIPS. A fork works too, but you lose the rustic chunky texture.
- Stop mixing when you see PEA-SIZED butter bits scattered throughout. Big clumps = crunch. Smooth paste = sadness.
- Sprinkle the topping LOOSELY over the filling. Do NOT press it down or pack it (this traps steam and kills your crisp).
- Bake at 350°F until golden brown. Bubbling fruit at the edges means you’re winning.
Storing & Reheating Leftovers
- REFRIGERATE PROMPTLY: cover with foil or stash in an airtight container. Holds up for 3-4 days.
- FREEZE IT: double-wrap in plastic and foil (or portion into containers). Stays solid for 3 months.
- OVEN REHEAT WINS: 350°F for 10-15 minutes uncovered to revive the CRUNCH. The microwave ruins texture!
- MICROWAVE WHEN LAZY: 30-second bursts do the job, but expect a soft topping (still tasty though).
What to Cook Next
- Strawberry Rhubarb Galette with Puff Pastry
- Best Peach Cobbler with Cake Mix
- Tasty Peach Crisp
- Strawberry Dump Cake
- Golden Rhubarb Galette with Peaches
- Easy Fig Bars
Estimated Nutrition
Estimated nutrition for the whole recipe (without optional ingredients):
- Calories: 2100-2300
- Protein: 23-27 g
- Fat: 65-75 g
- Carbohydrates: 390-430 g
Ingredients
For the filling:
- 4 cups raspberries (fresh or frozen)
- 1/2 cup brown sugar
- 1.5 tbsp cornstarch
- 1 tbsp fresh lemon juice
- 1 tsp vanilla extract
- 1 tsp freshly grated lemon zest
For the topping:
- 1.5 cups old fashioned oats
- 1/2 cup all-purpose flour
- 1/2 cup brown sugar, packed
- 1 tsp pumpkin pie spice
- 10 tbsp unsalted butter, chilled and cubed
- 1/4 tsp fine sea salt
Step 1: Preheat and Prep
- Butter or cooking spray
Preheat your oven to 350°F and lightly grease an 8×8 inch or 9×13 inch baking dish with butter or cooking spray.
While the oven heats, measure out all your ingredients and have them ready—this ensures smooth cooking with no scrambling.
Step 2: Mix the Fruit Filling
- 4 cups raspberries
- 1/2 cup brown sugar
- 1.5 tbsp cornstarch
- 1 tbsp fresh lemon juice
- 1 tsp vanilla extract
- 1 tsp freshly grated lemon zest
In a medium bowl, combine the raspberries, 1/2 cup brown sugar, cornstarch, fresh lemon juice, vanilla extract, and lemon zest.
Gently toss everything together until the raspberries are evenly coated and the cornstarch is fully incorporated—this thickens the fruit juices as it bakes.
Transfer the mixture to your prepared baking dish, spreading it into an even layer.
Step 3: Create the Oat Mixture
- 1.5 cups old fashioned oats
- 1/2 cup all-purpose flour
- 1/2 cup brown sugar, packed
- 1 tsp pumpkin pie spice
- 10 tbsp unsalted butter, chilled and cubed
- 1/4 tsp fine sea salt
In a separate bowl, whisk together the oats, all-purpose flour, 1/2 cup packed brown sugar, pumpkin pie spice, and fine sea salt.
Add the chilled, cubed butter and use a fork or your fingertips to work it into the dry mixture until it resembles coarse breadcrumbs with pea-sized pieces of butter throughout.
I prefer using my fingertips for better control—it gives you a more rustic, chunky texture that bakes up beautifully crispy.
Step 4: Layer and Bake
- crumble topping from Step 3
- raspberry filling from Step 2
Spread the crumble topping from Step 3 evenly over the raspberry filling, breaking up any large clumps as you go.
Don’t pack it down—keeping it loose allows it to bake up light and crunchy.
Place in the preheated 350°F oven and bake for 30–35 minutes, until the topping is golden brown and the fruit begins to bubble slightly around the edges.
Step 5: Rest and Serve Warm
Remove from the oven and let the crumble cool for 10–15 minutes on a wire rack—this brief resting time allows the filling to set slightly so it won’t run all over your plate.
Serve warm, ideally with a dollop of whipped cream or vanilla ice cream to contrast the tart raspberries and sweet, buttery crumble.
Sweet Raspberry Crumble
Ingredients
Method
- Preheat your oven to 350°F and lightly grease an 8x8 inch or 9x13 inch baking dish with butter or cooking spray. While the oven heats, measure out all your ingredients and have them ready—this ensures smooth cooking with no scrambling.
- In a medium bowl, combine the raspberries, 1/2 cup brown sugar, cornstarch, fresh lemon juice, vanilla extract, and lemon zest. Gently toss everything together until the raspberries are evenly coated and the cornstarch is fully incorporated—this thickens the fruit juices as it bakes. Transfer the mixture to your prepared baking dish, spreading it into an even layer.
- In a separate bowl, whisk together the oats, all-purpose flour, 1/2 cup packed brown sugar, pumpkin pie spice, and fine sea salt. Add the chilled, cubed butter and use a fork or your fingertips to work it into the dry mixture until it resembles coarse breadcrumbs with pea-sized pieces of butter throughout. I prefer using my fingertips for better control—it gives you a more rustic, chunky texture that bakes up beautifully crispy.
- Spread the crumble topping from Step 3 evenly over the raspberry filling, breaking up any large clumps as you go. Don't pack it down—keeping it loose allows it to bake up light and crunchy. Place in the preheated 350°F oven and bake for 30–35 minutes, until the topping is golden brown and the fruit begins to bubble slightly around the edges.
- Remove from the oven and let the crumble cool for 10–15 minutes on a wire rack—this brief resting time allows the filling to set slightly so it won't run all over your plate. Serve warm, ideally with a dollop of whipped cream or vanilla ice cream to contrast the tart raspberries and sweet, buttery crumble.