Step 1: Preheat your oven to 350°F (175°C).
Step 2: Line a 9x13-inch baking pan with parchment paper.
Step 3: Whisk together flour, baking soda, and salt in a medium bowl.
Step 4: Cream together butter, light brown sugar, and granulated sugar until light and fluffy.
Step 5: Add eggs one at a time, mixing well after each addition, then stir in vanilla extract.
Step 6: Gradually add the dry ingredients to the wet mixture, mixing until just combined.
Step 7: Fold in chocolate chips and pretzels until evenly distributed.
Step 8: Spread the batter into the prepared baking pan.
Step 9: Bake for 25-30 minutes, until the edges are golden brown.
Step 10: Allow to cool, then drizzle with melted chocolate and peanut butter if desired.