This crisp is summer in a casserole dish! The combination of juicy peaches and sweet-tart blueberries is divine—so much so that you won’t even notice that our version is lower in sugar. Although frozen fruit will suffice in a pinch, we recommend you use the freshest varieties you can find, even if that means substituting another berry and stone fruit.
How to Make It
Preheat oven to 350°F. Gently stir together peaches, blueberries, cornstarch, lemon zest, lemon juice, and 1/4 cup of the granulated sugar in a large bowl. Spoon mixture into an 11- x 7-inch (2-quart) baking dish.
Whisk together flour, brown sugar, salt, cinnamon, and remaining 1/4 cup granulated sugar until mixture is completely smooth (no clumps). Add butter, and toss to coat. Using fingers, rub butter into flour until a pebble consistency is reached and flour is fully moistened. Stir in oats. Crumble topping evenly over peach mixture.
Bake in preheated oven until top is golden and fruit is bubbling, about 45 minutes. Serve warm.