Best Brownies

1: Heat oven to 325 degrees.

2: Melt butter in saucepan with cocoa and stir until smooth. Add espresso powder. Remove from heat and allow to cool for a few minutes, then transfer to a large bowl. Whisk in eggs, one at a time. Stir in vanilla.

3: In a separate bowl, combine sugar, flour, nuts and salt. Add to the cocoa-butter mixture. Stir until just combined.

4: Pour into a greased 8 x 8-inch-square pan. Sprinkle with flaky sea salt and bake for 30 to 35 minutes. Do not overbake; the brownies should be gooey.

5: Let cool, then cut into bars.