1. Craft the Brownie Canvas

Prepare a 9-inch square baking vessel by lining it with parchment paper, ensuring generous overhangs for effortless extraction. Heat the oven to a precise 350F (175C), creating an ideal environment for brownie transformation.

1. Blend Chocolate Alchemy

Whisk melted butter with granulated sugar and rich cocoa powder until a silky, uniform mixture emerges. Incorporate egg and vanilla extract, stirring until the batter achieves a glossy, harmonious consistency. Gently fold in flour and salt, maintaining a delicate touch to preserve the brownie’s tender texture.

1. Bake the Chocolate Foundation

Distribute the batter evenly across the prepared pan, creating a thin, uniform layer. Slide into the preheated oven and bake for 10-12 minutes, watching for a set yet yielding surface. Allow the brownie to cool completely within the pan, developing its characteristic chew.

1. Construct the Ice Cream Canvas

Carefully elevate the cooled brownie using parchment edges. Slice the sheet precisely in half, creating two equal rectangular platforms for the frozen filling.

1. Layer Frozen Decadence

Liberate the ice cream from its frozen state, letting it soften slightly. Spread the creamy layer uniformly across one brownie base, using a spatula to create a smooth, even surface. Gently position the second brownie layer atop the ice cream, applying gentle pressure to secure the sandwich.

1. Chill and Set

Encase the assembled creation in plastic wrap or aluminum foil, protecting it from freezer fluctuations. Allow it to hibernate in the freezer for a minimum of two hours, transforming into a solid, harmonious treat.

1. Serve with Precision

Extract the frozen delicacy from its chilly chamber. Employ a sharp knife to slice into individual portions, revealing the layered masterpiece. Serve immediately or return to the freezer for future indulgence.