Preheat your oven to 350°F (175°C) and line a 9x13 inch baking pan with parchment paper.

In a medium bowl, whisk together the flour, baking soda, and salt until well combined.

In a large mixing bowl, cream together the butter, light brown sugar, and granulated sugar until light and fluffy, about 2-3 minutes.

Beat in the eggs and vanilla extract until fully incorporated.

Gradually mix the dry ingredients into the wet mixture until just combined.

Fold in the peanut butter, chocolate chips, and pretzels until evenly distributed.

Pour the batter into the prepared baking pan and spread evenly.

Sprinkle peanut butter chips, chocolate chips, and pretzels generously over the top.

Bake for 25-30 minutes or until golden brown and a toothpick comes out with a few moist crumbs.

Let cool in the pan for 15-20 minutes before lifting out and cutting into squares.