Growing up, my mom would make the most delicious brownies marbled with caramel on top. She would bake them in sheet pans and they always seemed like the perfect way to end a long week. Truly anything she created made the week seem special.
Start by preheating your oven to 350°F. In a large bowl add butter and melt in the microwave. To that, add in the sugars and give it another cycle in the microwave for 30 seconds. Wisk really well until the sugars and butter are nice and creamy. Add in eggs, egg yolk, and vanilla. Whisk again and then add in melted chocolate (melt the chocolate in a glass bowl in the microwave for 30 seconds at a time, stirring between intervals) stir chocolate into the sugar mixture. Once that is fully incorporated, add flour, cocoa powder, and salt directly into the bowl. Stir in the dry ingredients with a spatula till flour and cocoa are incorporated.
Dump the batter into a 10" cast iron skillet or 9x9 pan, then dollop some dulce de leche all over and swirl into the batter. You can do this using a skewer or chop stick (or other slender utensil). Place your beautiful brownies into the oven and bake for 25-30 minutes. Brownies should be set in the center. Remove from the oven and let rest for about 10 minutes before you top with ice cream and dive in.
