Caramel Brownies with Ghosts

Ingredients

• 2 sticks Challenge Butter, melted, plus more for pan
• 1 cup all-purpose flour
• 1 cup Dutch-processed cocoa powder
• 1 teaspoon kosher salt
• 1 cup granulated sugar
• 1 cup packed light-brown sugar
• 4 large eggs, room temperature
• 1 Tablespoon vanilla extract
• ¾ cup Salted Caramel Sauce
• 1 ½ tsp powdered gelatin
• ⅓ cup cold water, divided
• 1 egg white
• ⅓ cup granulated sugar
• 1 ½ tsp corn syrup
• ½ vanilla extract
• black decorating gel