TOSS chopped cookies and bread cubes in greased 2-quart casserole.
MIX milk, eggs, sugar, margarine and vanilla with wire whisk until well blended. Pour over cookie mixture; stir gently until well blended. Cover.
BAKE at 350°F for 30 minutes. Uncover. Bake an additional 20 minutes or until knife inserted in center comes out clean. Serve warm.