Preheat your oven to 350°F (175°C) and prepare a 9x13-inch baking pan.

In a large mixing bowl, combine the brownie mix, eggs, melted butter or oil, and water according to the package instructions. Stir until fully combined.

Pour the brownie batter into the greased baking pan and spread the mixture evenly across the surface.

Bake for 20 to 25 minutes. Insert a toothpick to check for doneness; it should come out with a few moist crumbs.

Allow the brownies to cool in the pan for at least 30 minutes or until completely cool before frosting.

Spread a generous layer of frosting over the cooled brownies.

Sprinkle colorful decorations like themed sprinkles and chocolate eggs across the top.