Preheat the oven to 350°F

In medium bowl, mix together the graham cracker crumbs, 1/4 cup sugar and melted margarine. Press into bottom of a greased 9x13 inch baking dish.

In another bowl, mix together the cream cheese and 3/4 cup of sugar until smooth. Blend in the eggs one at a time, then stir in vanilla and mashed banana. Pour into the prepared crust.

Bake for 30 minutes in the preheated oven or until the center is set. Cool and refrigerate for at least 3 hours.

Combine evaporated milk and carmels in a saucepan over medium heat. Cook stirring frequently until carmels are melted and the mixture is smooth.

Garnish the cheesecake with banana slices, and drizzle carmel sauce over cheesecake.

Alternative method: Purchase carmel in a jar and pour over cheesecake. Top carmel with whipped cream, then add sliced bananas.