Brownies: Over baked Sides and Bottom

Thank you for your advice. Baking solo without a lot of support can be somewhat challenging at times...there are so few place to go for help. I'll redo the recipe and incorporate your suggestions. Be well...stay safe.

I find brownies are best a little "underbaked." A toothpick inserted in the middle should come out even slightly "wet" or at least with moist crumbs adhering; if it's coming out clean, the brownies are overbaked. Also, if you lower the heat, the brownies will bake more evenly. Start testing 5 - 8 minutes before the official amount of time is up.
What type of pan are you using? A metal pan works best, rather than a glass one which can overbake them. Also, you should line it with a parchment sling so that you can lift them out when they've cooled a bit.