Step 1

Preheat the oven to 350°F, and coat a 9-inch square pan with nonstick cooking spray.

Step 2

Break the graham crackers into pieces, and add to a food processor or blender and pulse into fine crumbs. Transfer the crumbs to a bowl, and mix in the egg whites until fully incorporated. Press the mixture into the bottom of the prepared pan.

Step 3

Sprinkle the coconut, miniature chocolate chips, and pecans over the graham cracker crust in the order listed.

Step 4

In a small bowl, melt the caramel candy squares in the microwave for 30 seconds or until melted and drizzle over the bars.

Step 5

In a small bowl, stir together the sweetened condensed milk, Greek yogurt, and sugar or sugar substitute. Evenly drizzle the milk mixture over the toppings.

Step 6

Bake at 350°F for 18-20 minutes. Cool completely to room temperature, and refrigerate for at least 3 hours before slicing into squares.