Preheat your oven to 350°F (175°C). While the oven heats, line a 9x13-inch baking pan with foil and spray it generously with nonstick cooking spray. This will help with easy removal later.
In the bowl of an electric mixer fitted with a paddle attachment, cream together light brown sugar and unsalted butter until the mixture becomes light and fluffy. This should take about 2 to 3 minutes. The goal is to incorporate air into the batter, making your blondies light and tender.
Once creamed, add the eggs and vanilla extract. Beat them in until everything is just combined. You want the mixture to look smooth and slightly thick.
In a separate bowl, whisk together the baking powder, salt, and all-purpose flour. Gradually add this dry mixture into the wet ingredients, mixing until just combined. Avoid overmixing, as this can make the blondies tough.
Now comes the exciting part! Stir in the Caramel Bits, chocolate chips, and chopped Milky Way bars. Make sure everything is evenly distributed throughout the batter.
With your hands sprayed with nonstick cooking spray to prevent sticking, press the sticky batter evenly into the prepared baking pan. It should fill the pan with an even layer.
Place the pan in the preheated oven and bake for about 22 to 25 minutes. Keep an eye on them—you're looking for a golden top, but the center should still be slightly jiggly when you remove them from the oven. They will continue baking as they cool.
Once baked, remove the pan from the oven and let it cool completely in the pan. This allows the blondies to set properly, making them easier to slice.
Once cooled, lift the blondies out of the pan using the foil edges. Slice them into squares and enjoy your heavenly Milky Way Blondies! Store leftovers in an airtight container for up to 4 days or freeze for up to 3 months.