Make ahead: Prepare through Step 2. Chill up to 1 week. Stir in berries before spooning into crust.
3 pounds Granny Smith apples
3 pounds Braeburn apples
1 1/2 cups sugar
1/2 cup all-purpose flour
1/2 cup butter
1 (12-oz.) package frozen blackberries (2 cups)
1 tablespoon all-purpose flour
How to Make It
Peel apples, and cut into 1/2-inch-thick wedges; toss with sugar and 1/2 cup flour.
Melt butter in a large skillet over medium-high heat; add apple mixture, and saute 15 to 20 minutes or until apples are tender. Remove from heat. Cool completely (about 1 hour).
Toss frozen blackberries with 1 Tbsp. flour, and stir into apple mixture. Use immediately.
Try This Twist! Cranberry-Apple Pie Filling: Omit blackberries and 1 Tbsp. flour. Reduce remaining flour from 1/2 cup to 1/3 cup. Stir in 1 cup sweetened dried cranberries just before removing apples from heat in Step