2/3 cup crushed reduced-fat vanilla wafers (about 20 wafers)
1 tablespoon all-purpose flour
2 teaspoons packed brown sugar
3/4 teaspoon ground cinnamon
1 tablespoon butter, melted
Whipped cream and shredded lemon zest, optional
Place blueberries in a large bowl. Combine the sugar, cornstarch, flour, cinnamon, lemon zest and juice, nutmeg and salt; sprinkle over blueberries and toss to coat. Transfer to a greased 8-in. square baking dish.
For topping, in a small bowl, combine the wafer crumbs, flour, brown sugar and cinnamon. Stir in butter until blended. Sprinkle over blueberry mixture.
Bake at 350° for 40-50 minutes or until filling is bubbly and topping is golden brown. Serve warm. Garnish with whipped cream and lemon zest if desired.