Karis's Favorite Toffee Cheesecake

Karis made this for my dad's birthday and it is probably one of the best cheescakes I have ever eaten!  She got it from a Philadelphia Cream Cheese book.

Ingredients:
2 pkg. cream cheese
1/2 cup packed brown sugar
1 tsp. vanilla
2 eggs
1 cup chopped toffee bars, divided
1 graham cracker crust

Directions:  Mix cream cheese, sugar, and vanilla on medium speed until well blended.  Add eggs; mix until blended.  Stir in 3/4 cup of the chopped toffee bars.  Pour into crust.  Sprinkle with remaining toffee bars.  Bake at 350 for 35-40 minutes or until center is almost set.  cool.  Refrigerate at least 3 hours.