my brownie recipe

This recipe came about when I made a mistake!
grease and flour 13x9" pan and oven at 350 deg
3 squares unsweetened chocolate
100 grams bittersweet choc
150 grams butter unsalted
1 tbsp cocoa
2 cups sugar
3 eggs
1 cup flour
2 tsp vanilla
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Melt butter and chocolates. beat the eggs and add sugar. then add choc mixture. add flour and vanilla and can add nuts optional. bake until done. about 22-25 minutes.