These delightful bars combine the sweetness of marshmallows with the crunch of walnuts, creating a treat that's perfect for any occasion.
Preheat your oven to 350°F.
Preheating ensures even baking from the start.
Grease an 8-inch square baking pan with butter or non-stick spray.
Use parchment paper for easy removal of the bars.
In a saucepan over medium heat, melt the butter and butterscotch chips, stirring until smooth.
Stir constantly to prevent the mixture from burning.
Remove the saucepan from heat and stir in the brown sugar until well combined.
Ensure the sugar is fully dissolved for a smooth texture.
Let the mixture cool slightly, then add the egg and vanilla, mixing thoroughly.
Adding the egg to a cooled mixture prevents it from cooking prematurely.
In a separate bowl, whisk together the flour, baking powder, baking soda, and salt.
Whisking aerates the dry ingredients for a lighter texture.
Gradually add the dry ingredients to the wet mixture, stirring until just combined.
Avoid overmixing to keep the bars tender.
Fold in the mini marshmallows and chopped walnuts.
Gently fold to evenly distribute the mix-ins without deflating the batter.
Spread the batter evenly into the prepared baking pan.
Use a spatula to smooth the top for even baking.
Bake in the preheated oven for 20-25 minutes, or until golden brown.
Check for doneness by inserting a toothpick into the center; it should come out clean.
Cool the bars in the pan on a wire rack before cutting into squares.
Cooling completely ensures clean cuts and prevents crumbling.
Serve the bars and enjoy!
Pair with a warm beverage for a delightful treat.