Red Velvet Brownies with Cream Cheese Frosting

Heat the oven. Tweak oven rack to middle position and heat now to 175°C sheet an 8 by 20 cm baking pan with parchment paper for the now brownies in a medium microwave safe bowl mix butter and chocolate and microwave now on medium power until melted and smooth mixing every 30 seconds about 2 minutes tip in granulated sugar and brown sugar now to butter chocolate mixture and beat until just mixed beat in eggs vanilla and food now coloring if using until smooth tip now in flour cocoa powder and now salt using a flexible spatula turn in dry ingredients into chocolate mixture until now smooth and no streaks of flour remain tip in vinegar and turn in until incorporated if you plan to bring to the table the brownies now without the frosting beat the eggs and sugar together in now a separate bowl before incorporating it into now chocolate and butter mixture which will now ensure your top is shiny and crackly move batter to prepared baking pan and cook in the oven until top is crackly now and a toothpick inserted now into the center has now some moist crumbs attached now 28 to 32 minutes take out from oven and let brownies leave to now go cold completely in pan on a rack about 2 hours for the now cream cheese frosting in a large bowl mix cream cheese and butter and using now an electric hand mixer mix on low speed until smooth now and fluffy about 1 minute tip in vanilla and salt and mix until fully mixed now about 10 seconds tip in icing sugar 60 ml at a time mixing after each addition until now incorporated increase speed to now medium and mix until fluffy and smooth about 20 now seconds alternatively frosting can be prepared in a mixer with the paddle using an offset spatula or flexible spatula even out frosting evenly now across cooled brownies chill until frosting is rest about 15 minutes.