Pre-heat oven to 350 degrees. Line 9x9 or 8x8 pan with parchment paper and lightly spray with cooking spray. Set aside for later.
Melt butter in the microwave. Use a large microwave safe bowl. This is what you will be building your brownie batter in.
Add in sugar and mix together well.
Add eggs, one or two at a time and mix until well incorporated.
Add flour and cocoa powder together (you can add your pinch of salt if desired here), and add to wet mixture. Add half at a time to make stirring easier. If you have extra add ins ( chocolate chips, walnuts, etc.) you can add them in after this step.
Pour batter into your lined pan and even out the top, making sure batter goes to each corner of the pan.
Bake for 28-42 minutes. The top of the brownies will look set, and a toothpick will come out with wet crumbs. If your toothpick is clean, you have over baked them. If you are using an 8x8 pan, shoot for the 34-42 mark. A 9x9 pan will take less time.
Let the brownies cool completely before cutting. Enjoy!!