Preheat oven to 350°F. Grease a 9x9 pan. In a bowl, melt butter in microwave until warm. Stir in the sugar, cocoa powder, and eggs until combined.
Next, add the flour and salt into the chocolate mixture. Pour the batter into the pan and bake for 25 minutes.
Allow the brownies to cool before serving. Top with sprinkles and enjoy!