Preheat Oven: Preheat your oven to 350°F (175°C). Grease or line an 8x8-inch baking pan with parchment paper.

Melt the Butter: In a medium saucepan over low heat, melt the butter. Remove from heat and stir in the granulated sugar until well combined.

Add Eggs and Vanilla: Let the mixture cool slightly, then beat in the eggs, one at a time, followed by the vanilla extract.

Mix Dry Ingredients: In a separate bowl, whisk together the cocoa powder, flour, salt, baking powder, and instant coffee granules.

Combine: Gradually add the dry ingredients to the wet mixture, stirring until just combined. If using, fold in the chocolate chips.

Bake: Pour the brownie batter into the prepared baking pan and spread it evenly. Bake in the preheated oven for 25-30 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs.

Cool and Serve: Allow the brownies to cool in the pan for about 10 minutes before transferring them to a wire rack to cool completely. Once cool, cut into squares and enjoy!