01 -
Preheat oven to 325°F. Grease or line a 9×13-inch baking pan with parchment paper, leaving an overhang for easy removal.
02 -
In a medium bowl, whisk together flour, baking soda, and salt. Set aside.
03 -
In a large bowl, blend melted butter with brown sugar and granulated sugar until smooth.
04 -
Beat in vanilla extract, the whole egg, and egg yolk until the mixture is light and creamy.
05 -
Gradually fold the dry ingredients into the wet ingredients, mixing until just combined to avoid overmixing.
06 -
Gently fold in the semi-sweet chocolate chips and green candy melts or M&M’s if using.
07 -
Spread the dough evenly in the prepared pan and press down gently for an even layer.
08 -
Bake for 25 to 30 minutes, or until edges are golden and a toothpick inserted in the center comes out with a few moist crumbs.
09 -
Let the bars cool completely in the pan on a wire rack before lifting out and cutting into 24 bars.