Preheat oven to 350F. Line a 9-inch square baking pan with parchment paper. Set aside.
Place butter in a medium bowl and microwave 30-60 seconds until melted. Whisk in espresso powder until smooth.
Add chocolate chips to butter mixture and return to microwave 60-90 seconds until chocolate chips are melted, stirring at 30 second intervals. Allow to cool slightly.
Whisk eggs, sugar, and vanilla into melted chocolate mixture until smooth. Fold in flour, cocoa powder, and salt until batter is thick and smooth. Spread batter in an even layer in prepared pan.
Bake brownies at 350F 25-30 minutes until a toothpick comes out with moist crumbs sticking to it. Cool brownies completely in pan on a wire cooling rack before slicing into squares. Enjoy!
Notes
Storing InstructionsStore brownies in an airtight container at room temperature up to 4 days. Freeze brownies up to 2 months