1. Heat oven to 400°F. Peel and slice apples into thin slices. Toss apples with granulated sugar, cornstarch and cinnamon.
2. Unroll crusts; place each on ungreased cookie sheet. Sprinkle 1/3 cup toffee bits over each crust; press lightly into crust.
3. Starting 2 inches from the edge of the crust, arrange apple slices by overlapping slightly in a circular spiral toward the center of the crust. Sprinkle 1/3 cup of remaining toffee bits over each apple center. Fold 2-inch edge of crust over apples. Sprinkle each crust edge with 1 teaspoon sugar crystals.
4. Bake 25 to 30 minutes or until crust is golden. Cool slightly. Serve warm or cool with sweetened whipped cream or ice cream, if desired. 2 tarts (8 servings each).
Note: Recipe may be halved.