Salted Caramel Brownies

1. Preheat oven to 350ºF.
2. Prepare brownies: Combine flour, sugar, cocoa, brown sugar, and baking powder in a large bowl, stirring well with a whisk. In a separate bowl, combine butter, eggs, and vanilla. Add butter mixture to flour mixture. Stir to combine. Scrape batter into a greased 9-inch square baking pan and bake at 350ºF for 19 minutes or until a toothpick in the center comes out with moist crumbs. Cool on a wire rack or in the fridge.
3. Prepare topping: Melt butter in a saucepan over medium heat. Add brown sugar and 1 1/2 tablespoons milk; cook 2 minutes. Remove from heat. Add vanilla and powdered sugar; stir with a whisk until smooth. Spread mixture evenly over cooled brownies. Let stand until set.
4. Combine the remaining 2 tablespoons milk and chocolate in a microwave-safe bowl; microwave on high for 45 seconds until melted with a silky consistency. Add to a Ziploc bag (carefully) and cut a small hole in one corner. Pipe out chocolate in your preferred design. Sprinkle sea salt over chocolate.