Lo-Cal Banana Mocha Cheesecake
["16 graham crackers (each 2 1/2-inch sq.), made into crumbs (more if you want a thicker crust)", "2 Tbsp. plus 2 tsp. margarine, softened", "artificial sweetener to equal 6 tsp. sugar, divided", "1 envelope unflavored gelatin", "1 c. cold water", "2 tsp. instant coffee powder", "4 ripe medium bananas, sliced and divided", "1 2/3 c. part-skim Ricotta cheese", "1 c. cottage cheese", "2 envelopes reduced-calorie hot cocoa mix"]
["Bake 1 chocolate cake mix according to directions in a jelly roll pan; cool."]
["crackers", "margarine", "sugar", "unflavored gelatin", "cold water", "coffee powder", "bananas", "Ricotta cheese", "cottage cheese"]