Step 1

Preheat oven to 400°F. In a large bowl, toss together oats, 1/2 cup flour, pecans, brown sugar, 1/2 cup granulated sugar, cinnamon, and zest of 1 orange. Add butter and gently press with fingers to incorporate into mixture; set aside.

Step 2

Place berries in a 12-inch skillet. Sprinkle with remaining 1/2 cup granulated sugar, zest of 1 orange, and 2 tablespoons flour and gently toss. Scatter oat mixture over berries. Transfer to oven and bake until fruit is bubbly and topping is golden, about 35 minutes.