Preheat & Prep: Preheat oven to 350°F (175°C). Grease a 9×13-inch pan or line with parchment paper.
Make Brownie Batter: In a large bowl, mix melted butter and sugar until smooth. Beat in eggs one at a time, then add vanilla.
Combine Dry Ingredients: Whisk flour, cocoa powder, and salt in a separate bowl. Gradually fold into wet ingredients until just combined. Don’t overmix!
Bake Brownies: Pour batter into the prepared pan and smooth the top. Bake for 20–25 minutes. The brownies should be set but slightly soft in the center.
Add Caramel & Pretzels: Pour caramel sauce evenly over warm brownies. Sprinkle crushed pretzels on top and gently press them in.
Finish Baking: Return to oven for 5–7 minutes to meld the caramel with brownies. Optional: sprinkle lightly with sea salt.
Cool & Slice: Let cool for at least 15 minutes before slicing. This helps the caramel set and makes cutting easier.