PREHEAT oven to 350°F. Prepare cake mix as directed on package. Stir in half of the chocolate chunks. Pour into greased 13x9-inch baking dish or shallow casserole dish; set aside.
POUR milk into large bowl. Add dry pudding mixes, flavored instant coffee and cinnamon. Beat with wire whisk 1 min. or until well blended. Pour over cake batter in center of pan; sprinkle with the remaining chocolate chunks.
BAKE 1 hour or until cake appears baked in the center. Cool slightly.