Line an 8x8-inch pan with foil, leaving about a 2-inch overhang on the sides to lift the bars out later.

Arrange 5 whole graham crackers to cover the bottom of the pan, breaking crackers as needed to fit and form an even layer.

Place one 11-oz bag of caramel pieces in a microwave-safe bowl. Melt in 30-second bursts, stirring between each burst, until smooth. Pour and spread the melted caramel evenly over the bottom graham cracker layer.

Place a second layer of 5 whole graham crackers on top of the caramel, breaking as needed to fit.

Place all 16 oz Dove Dark Chocolate in a microwave-safe bowl. Melt in 30-second bursts, stirring between each burst, until completely smooth. Transfer about one-third of the melted chocolate to a separate bowl and set it aside for the final topping.

Add the 2 cups mini marshmallows to the remaining (about two-thirds) melted chocolate and stir until the marshmallows are evenly coated. Spread this marshmallow-chocolate mixture evenly over the second graham cracker layer.

Place the final layer of 5 whole graham crackers on top of the marshmallow-chocolate layer, breaking as needed to fit.

Place the second 11-oz bag of caramel pieces in a microwave-safe bowl. Melt in 30-second bursts, stirring between each burst, until smooth. Pour and spread the melted caramel evenly over the top graham cracker layer.

Pour the reserved one-third of the melted chocolate over the caramel and spread to cover the top. Optional: sprinkle sea salt on top.

Let the bars cool and set (at room temperature or in the refrigerator). Use the foil overhang to lift the slab from the pan and cut into bars.