Preheat the oven to 325 Fahrenheit and allow to preheat while you are make the batter.
Melt the butter over low heat with the chocolate. Stir consistently until incorporated and glossy and lovely.
Remove the butter and chocolate (once melted together) off the stove, and add the sugar (stir as you add), the two eggs and the vanilla. Stir until combined.
Add the flour, salt and nuts. Stir until combined.
Prepare a 8-inch baking pan. Line with parchment paper, and pour in the batter. Bake in the oven for 25-30 minutes (each oven will be unique). Bake until softly firm in the middle.
Remove from the oven. Leave in the pan until the brownies have cooled. Cut into small or large squares and enjoy with a lovely hot cup of something wonderfully cozy.