Mix crushed cookies and melted butter. Press into 9-inch springform pan or a 9x13-inch pan. Beat cream cheese until fluffy. Beat in condensed milk. Beat together eggs and vanilla. Add to cheese mixture. Mix 1/2 cup chocolate chips with flour; add to cheese mixture. Spread over crust. Sprinkle 1/2 cup chocolate chips over top. Bake at 300 degrees for 60-65 minutes.