Quick Recipe Version (TL;DR)
Quick Ingredients
- 2 lb ripe plums (8 to 10), pitted and sliced 1/2 inch thick
- 1 tbsp lemon juice
- 1 1/2 tbsp cornstarch
- 2/3 cup packed light brown sugar, divided
- 1 cup old-fashioned rolled oats
- 3/4 cup all-purpose flour
- 1/2 cup chopped almonds or pecans
- 1/2 tsp fine sea salt
- 3/4 tsp ground cardamom
- 1/2 tsp ground ginger
- Seeds from 1 vanilla bean or 2 tsp vanilla bean paste (or 2 tsp vanilla extract)
- 8 tbsp (113 g) unsalted butter, melted (browned if you like)
- 1 tbsp demerara/turbinado sugar (optional, for sparkle)
Do This
- 1. Heat oven to 375°F (190°C). Butter a 2-quart baking dish (about 9-inch square).
- 2. Toss plums with lemon juice, 1/3 cup brown sugar, and cornstarch; spread in dish.
- 3. Mix oats, flour, nuts, remaining 1/3 cup brown sugar, salt, cardamom, and ginger.
- 4. Stir vanilla into melted butter (brown it first if desired); drizzle over dry mix and toss into clumps.
- 5. Scatter topping over plums; sprinkle with demerara sugar if using.
- 6. Bake 40 minutes until fruit bubbles and topping is deep golden; rest 15 minutes before serving.
Why You’ll Love This Recipe
- Perfectly balanced: tart, juicy plums under a warmly spiced, crunchy oat-nut lid.
- Big flavor, simple steps: pantry spices, one bowl topping, weeknight-friendly.
- Customizable: use your favorite nuts, adjust sweetness, and choose your garnish.
- Comforting and crowd-pleasing, especially with vanilla ice cream or lightly sweetened yogurt.
Grocery List
- Produce: 2 lb ripe plums, 1 lemon
- Dairy: Unsalted butter; optional vanilla ice cream or heavy cream for serving
- Pantry: Old-fashioned rolled oats, all-purpose flour, light brown sugar, cornstarch, cardamom, ground ginger, vanilla bean or paste, demerara sugar (optional), nuts (almonds or pecans), fine sea salt
Full Ingredients
Plum Filling
- 2 lb ripe plums (8 to 10 medium, about 900 g), pitted and sliced 1/2 inch thick
- 1 tbsp fresh lemon juice
- 1 1/2 tbsp cornstarch (use 2 tbsp if your plums are very juicy)
- 1/3 cup packed light brown sugar (67 g)
- Pinch fine sea salt
Nutty Oat Topping (cardamom, ginger, vanilla)
- 1 cup old-fashioned rolled oats (90 g)
- 3/4 cup all-purpose flour (95 g)
- 1/2 cup chopped almonds or pecans (60 g)
- 1/3 cup packed light brown sugar (67 g)
- 1/2 tsp fine sea salt
- 3/4 tsp ground cardamom
- 1/2 tsp ground ginger
- Seeds from 1 vanilla bean or 2 tsp vanilla bean paste (or 2 tsp pure vanilla extract)
- 8 tbsp unsalted butter (113 g), melted; optional: brown the butter
- 1 tbsp demerara or turbinado sugar, optional, for sparkle
To Serve (optional)
- Vanilla ice cream, lightly sweetened whipped cream, or thick Greek yogurt
Step-by-Step Instructions
Step 1: Heat the oven and prepare the pan
Position a rack in the center of the oven and heat to 375°F (190°C). Lightly butter a 2-quart baking dish (about 9-inch square or similar). This helps prevent sticking and encourages caramelized edges.
Step 2: Toss the plums
In a large bowl, combine the sliced plums, lemon juice, cornstarch, brown sugar, and a pinch of salt. Gently toss until the fruit is evenly coated and the cornstarch disappears. Spread the plums into an even layer in the prepared baking dish. If your plums are especially tart, you can add up to 1 additional tablespoon brown sugar.
Step 3: Make the spiced oat topping
In a separate bowl, mix the oats, flour, chopped nuts, brown sugar, salt, cardamom, and ginger. Melt the butter. Split the vanilla bean and scrape seeds into the melted butter (or whisk in the vanilla paste/extract).
Optional but excellent: brown the butter by cooking it in a small saucepan over medium heat, swirling, until it smells nutty and turns amber with browned milk solids on the bottom, 3 to 4 minutes. Immediately stir in the vanilla to stop the cooking.
Drizzle the vanilla butter over the dry ingredients and stir until evenly moistened. Use your hands to squeeze the mixture into pea- to marble-sized clumps—these bake up extra crisp.
Step 4: Assemble the crisp
Scatter the clumpy topping evenly over the plums, leaving a few small gaps so steam can escape. If you like a little extra crunch and sparkle, sprinkle the top with the demerara sugar.
Step 5: Bake until bubbly and golden
Bake for 40 minutes, until the fruit is bubbling vigorously around the edges and the topping is deep golden brown. Rotate the dish halfway through baking. If the topping browns too fast before the fruit bubbles, tent loosely with foil for the last 10 minutes.
Step 6: Rest and serve warm
Let the crisp cool for 15 minutes to thicken the juices. Serve warm with a scoop of vanilla ice cream, a spoonful of lightly sweetened whipped cream, or a dollop of Greek yogurt. The contrast of hot, spiced topping and cool cream is heavenly.
Pro Tips
- Choose ripe but still-firm plums; very soft plums can collapse and release excess liquid.
- Adjust thickener to fruit: very juicy plums benefit from 2 tbsp cornstarch; firmer fruit can use 1 to 1 1/2 tbsp.
- For ultra-crispy crumbs, refrigerate the assembled dish for 10 minutes before baking to firm the buttered topping.
- Gluten-free: use certified GF oats and a 1:1 gluten-free baking flour blend.
- Dairy-free/vegan: swap plant-based butter (or refined coconut oil) for the butter; flavor is great with coconut sugar, too.
Variations
- Raspberry-Plum Crisp: Fold 1 cup fresh raspberries into the plums and increase cornstarch to 2 tbsp.
- Pistachio–Rose Cardamom: Use pistachios instead of almonds and add 1/2 tsp rose water to the plums.
- Gingerbread Twist: Add 2 tbsp mild molasses to the topping and 1/2 tsp cinnamon to the dry spices.
Storage & Make-Ahead
Refrigerate leftovers, covered, for up to 3 days. Re-crisp in a 350°F (175°C) oven for 10 to 15 minutes (or 325°F air fryer for 5 to 7 minutes). The topping can be mixed and refrigerated up to 3 days ahead or frozen for 2 months; use from cold for extra crunch. To freeze the unbaked crisp, assemble, wrap well, and freeze up to 2 months; bake from frozen at 350°F (175°C) for about 55 to 60 minutes until bubbly and golden.
Nutrition (per serving)
Approximate for 1/6 of recipe (without ice cream): 460 calories; 21 g fat; 63 g carbohydrates; 5 g fiber; 32 g sugars; 6 g protein; 230 mg sodium. Values are estimates and will vary with specific ingredients and serving size.
