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Step 1: Mix together eggs, cocoa powder, salt, baking powder, instant espresso, and vanilla.
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Step 2: In a separate bowl, cream butter and sugar, then microwave gradually (15 sec at a time) until sugar dissolves and is shiny.
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Step 3: Combine the egg and butter mixtures well, then add flour and mix gently, do not overmix.
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Step 4: Add chocolate chips and fold until combined.
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Step 5: Pour into a 9x9 pan and bake at 350 for 28-30 min.