Oatmeal-Apple Crisp adapted from Cooking Light

1/2 cup whole-wheat flour
3/4 cup quick-cooking oats
2 tablespoons ground flax seed
3/4 cup packed dark brown sugar, divided
3/4 teaspoon ground cinnamon, divided
1/2 cup chilled butter, cut into small pieces
6 cups chopped peeled Granny Smith apple (about 2 1/2 pounds)
Cooking spray

Lightly spoon flour into a dry measuring cup; level with a knife. Combine flour, oats, flax seed, 1/2 cup sugar, and 1/2 teaspoon cinnamon in a medium bowl; cut in butter with a pastry blender or 2 knives until mixture resembles coarse meal.

Combine 1/4 cup sugar, 1/4 teaspoon cinnamon, apples in a 13 x 9-inch baking dish coated with cooking spray. Sprinkle with oat mixture. Bake at 375° for 30 minutes or until apples are tender.