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

In a microwave-safe bowl, combine melted butter and cocoa powder. Stir until smooth.

In a large mixing bowl, whisk together sugar and eggs until creamy. Add the butter mixture and vanilla extract; mix well.

Gradually fold in flour until just combined; avoid overmixing for fudginess.

Pour the batter into the prepared pan, spreading evenly. Bake for 20-25 minutes or until a toothpick comes out with moist crumbs.

Once cooled, decorate with green and yellow frosting to resemble a football field.