In a bowl, combine flour and brown sugar. Cut in butter until mixture resembles coarse crumbs. Stir in walnuts. Reserve 1 cup. Press remaining crumbs into ungreased 9x13 inch pan. Bake for 12 minutes.
For filling, beat cream cheese and sugar until light and fluffy. Add eggs, one at a time, beat well after each addition. Beat in milk, lemon juice and vanilla, pour over crust. Sprinkle with reserved crumbs.
Bake 25 - 30 minutes longer or until edges are lightly browned and filling is almost set. Cool in pan on a wire rack.Cut into squares. Garnish with cherries if desired. Store in the refrigerator.