These classic, chewy brownies come together fast with the help of a microwave. The result is indulgent, chocolaty goodness.
Preheat oven at 350-degrees. Line an 8x8 or 9x9 baking pan with parchment paper and apply nonstick spray.
In a medium bowl, combine the flour, baking powder, salt, and espresso powder (if using). Set aside.
Place the butter, chocolate, and oil in a large microwave-safe bowl. Heat in short bursts, stirring well between each, until the chocolate is melted. Add both sugars and stir together. Whisk in the eggs until the batter is glossy and smooth.
Pour in the dry ingredients and mix until just combined. Pour batter into the prepared pan and smooth out the top.
Bake until the brownies pass the toothpick test in the middle, about 35 to 40 minutes. Let cool in pan for about 30 minutes, then lift the block out by the parchment to completely cool on a rack. Slice into bars. Keep stored in an airtight container.
OM NOM NOM!