Nectarine and Blackberry Crisp with Oat Topping Recipe

Blackberry crisp is a classic summer dessert. Adding ripe nectarines creates a nectarine blackberry crisp with a crunchy oat topping that highlights both stone fruit and berries. Serve warm with a scoop of vanilla ice cream for a perfect finish to a summer meal.

Summer berries—blueberries, blackberries, raspberries—make excellent crisps, and stone fruits like peaches, apricots, and nectarines pair beautifully with them. The combination of juicy fruit and a buttery oat topping yields a dessert that is both comforting and bright. This version balances slightly firm nectarine slices with the juiciness and color of blackberries for an attractive and flavorful bake.

Nectarines hold their shape better than very ripe peaches when baked, turning tender without becoming mushy. Blackberries add a lovely pink-reddish hue and a touch of tartness that complements the nectarine’s sweetness.

The best part of any crisp is the topping: a mix of flour, oats, brown sugar, and a hint of cinnamon bound with cold butter to form golden, crunchy clumps. Sliced almonds folded into the topping add extra texture and a mild nutty flavor.

Ingredients for Nectarine Blackberry Crisp

For the crunchy oat topping:

• flour
• old fashioned oats
• brown sugar
• sugar
• cinnamon
• salt
• butter
• sliced almond

And for the fruit filling:

• 4-5 nectarines (slightly firm)
• 1 1/2 cup blackberries
• sugar
• cornstarch
• vanilla extract

Thickener or No-Thickener for a Fruit Crisp?

Some bakers skip thickeners, but for juicy summer fruits I prefer a small amount of cornstarch. One to two tablespoons (depending on fruit ripeness and juiciness) helps the filling set so it isn’t too runny or overly gluey. Cornstarch gives a clear, smooth finish; if you use flour instead, you’ll need about double the amount and it can yield a slightly pastier texture.

• Flour or Cornstarch? I recommend cornstarch for a light, clean-thickened filling. If using flour, double the quantity for a similar result.

How to make Nectarine Blackberry Filling

Choose slightly firm nectarines so they hold their shape while baking. Very ripe nectarines can become too soft. Nectarines can be a bit tricky to pit cleanly—slice around the pit and remove any clingstone portions before cutting into wedges.

In a medium bowl, combine the nectarine slices, blackberries, sugar, cornstarch, and vanilla. Toss gently to coat the fruit evenly, then set the mixture aside while you prepare the topping.

How to make Oat Crisp Topping

In a large bowl, stir together the flour, oats, brown sugar, granulated sugar, cinnamon, and salt. Cut cold butter into small cubes and add to the dry mixture. Using pastry scrapers, a dough blender, or your fingertips, work the butter in until the mixture forms coarse clumps that will bake to a crisp, crumbly topping.

Fold in the sliced almonds so they are evenly distributed through the topping. The almonds add crunch and a toasty note after baking.

Spread the fruit mixture in a 2-quart baking dish and evenly sprinkle the oat topping over the fruit. Bake at 375°F (190°C) for 45–50 minutes, or until the fruit is bubbling and the topping is golden brown. Allow the crisp to cool slightly before serving so the filling sets a bit.

Serve the nectarine blackberry crisp warm, ideally with a scoop of vanilla ice cream. The contrast of warm fruit and cold ice cream makes this a crowd-pleasing summer dessert.

Leftovers can be stored in the refrigerator for 3–4 days. To reheat in the oven, bring the crisp to room temperature while preheating the oven to 350°F (175°C), then warm for 10–15 minutes until heated through. You can also microwave individual portions until warm.