Step 1: Preheat your oven to 350°F (175°C).
Step 2: Line your 9x13 inch baking pan with parchment paper.
Step 3: In a large mixing bowl, whisk together the melted butter and packed light brown sugar until combined. Add the eggs and vanilla extract, mixing until smooth.
Step 4: In another bowl, sift together the all-purpose flour, salt, baking powder, and baking soda.
Step 5: Gradually add the dry ingredients to the wet mixture, stirring gently until just combined.
Step 6: Gently fold in the chocolate chips.
Step 7: Pour the batter into the prepared baking pan and spread it evenly.
Step 8: Bake for 25-30 minutes, or until the edges are golden brown and a toothpick comes out clean.
Step 9: Cool in the pan for 10 minutes, then lift out using parchment paper and let cool completely on a wire rack before cutting into squares.