Preheat your oven to 350°F (175°C). Grease a 9x13-inch baking pan and line it with parchment paper or aluminum foil, leaving some overhang on the sides for easy removal later.
Prepare the Graham Cracker Crust: In a mixing bowl, combine the 1 ½ cup Graham crackers and 1 stick unsalted butter . Stir until the crumbs are evenly coated with butter. Press the mixture firmly and evenly into the prepared baking pan, creating the crust.
Layer the Ingredients: Sprinkle the 1 cup chocolate chips evenly over the graham cracker crust. Follow with the 1 cup chopped nuts and, if desired, the 1 cup butterscotch chips or caramel bits For added sweetness and chewiness, you can also add 1 cup mixed dried fruits like raisins, cranberries, or cherries.
Pour Sweetened Condensed Milk: Evenly drizzle the 1 cup sweetened condensed milk over the top of the layers, making sure all ingredients are covered. The sweetened condensed milk will bind everything together as it bakes.
Bake the Bars: Place the baking pan in the preheated oven and bake for 25-30 minutes or until the edges are golden brown and the center is slightly soft. Keep an eye on them to avoid overbaking.
Cool and Cut: Once baked, remove the pan from the oven and let the bars cool completely in the pan. This cooling process helps the layers set and hold together. Once cool, use the parchment paper or aluminum foil overhang to lift the bars out of the pan. Place them on a cutting board and cut them into squares.
Notes
For the graham cracker crumbs, you can either use store-bought crumbs or crush graham crackers in a food processor until they resemble fine crumbs.You can customize the layers by adding or omitting ingredients according to your preference.Get creative and add your favorite toppings! Be sure to press the graham cracker crust firmly into the pan to create a solid base that will hold the layers together.Do not cut the bars while they are still warm; allow them to cool completely to achieve neat and clean slices.Sweetened condensed milk is the key to binding the layers together, so make sure to distribute it evenly.