Preheat the oven to 325 F. Place cast iron skillet on stovetop burner.
Cut butter into 6 chunks and place in skillet with the chocolate. Cook over very low heat, stirring occasionally with a wooden spoon.
Because the heat is low, it can take some time, so measure out your other ingredients while it's melting, so you aren't tempted to turn up the heat!
When the chocolate and butter are completely melted, remove pan from the heat and add both sugars. Stir until everything is combined.
Add eggs, one at a time, stir well after each addition.
Add vanilla, stir well.
Add flour and salt and stir until there are no traces of flour left.
Use a rubber spatula around the edge of the pan to clean off the sides and get all the batter into the middle.
Place skillet in the oven and bake for 50 minutes. Insert a toothpick into the center to test for doneness. Toothpick should come out clean, with the possibility of a couple of crumbs. If it's still wet, put back in the oven and bake at 5 minute intervals.
Allow to cool on a wire rack for about 15 minutes. If you like warm brownies with ice cream and chocolate sauce (mmmmmmm!), cut a wedge now. :) Otherwise, cool brownies completely before cutting into wedges.
This recipe for Brownies in a Cast Iron Skillet was printed from AmandasCookin.com - https://amandascookin.com/brownies-in-cast-iron-skillet/ and can only be printed for education or personal use.