Chocolate Chip Cheesecake

1 1/2 c finely crushed oreos (abt 18 cookies)
3 Tbls margarine, melted
3- 8 oz pkg cream cheese, softened
1 can sweetened condensed milk
3 eggs
2 tsp vanilla
1 c mini-chocolate chips
1 tsp flour

Combine cookie crumbs and margarine and press into bottom of pan.    In a large bowl, beat cream cheese until fluffy.   Gradually beat in sweetened condensed milk until smooth.  Add eggs and vanilla and mix well.   In a small bowl, toss 1/2 c. of choc. chips in the 1 tsp. of flour.   Stir into cheesecake.   Pour mixture over crust.   Sprinkle remaining choc. chips on top.  Bake at 300 deg. For 1 hr. until lightly brown and center is set.   Cool and refrigerate. (Borden Sweetened Condensed milk recipes)