Step 1: Prepare the baking pan and oven
Preheat your oven to 350°F (175°C). Grease an 8×8-inch square baking pan or line it with parchment paper. Parchment makes it easier to lift the brownies out once baked, keeping them neat for slicing and serving.
Step 2: Combine the wet ingredients
In a large mixing bowl, add the melted butter and granulated sugar. Whisk or stir them together until fully blended and creamy. Add the eggs one at a time, mixing thoroughly after each addition so the batter becomes smooth and glossy. Pour in the Baileys Irish Cream and mix again until the liquid is fully incorporated.
Step 3: Add the dry ingredients
Sift together the flour, cocoa powder, and salt to avoid any clumps and ensure a smoother batter. Add the dry mixture into the wet mixture gradually. Gently fold the batter just until everything is combined. Avoid over-mixing, as this can lead to tougher brownies.
At this stage, the batter should be thick, rich, and shiny.
Step 4: Bake the brownies
Pour the batter into the prepared baking pan and spread evenly with a spatula. Bake in the preheated oven for 20-25 minutes. You can test for doneness by inserting a toothpick in the center: if only moist crumbs cling to it, the brownies are perfectly fudgy.
Remove from the oven and allow the brownies to cool completely before frosting. Resist cutting into them too soon—cooling helps them set properly.
