Preheat your oven to 325°F. Grease a 9x9-inch baking pan with butter or cooking spray, or line it with parchment paper.
In a microwave-safe bowl, melt the butter until fully melted in 30 second increments.
In a large mixing bowl, combine the melted butter and sugar. Whisk until smooth. Add in the eggs and vanilla extract, and beat until well combined.
Sift in the cocoa powder, flour, and salt into the wet mixture. Stir until just combined with a wooden spoon.
Pour the brownie batter into the prepared baking pan and spread it out evenly.
Bake for 15 minutes, or until a toothpick inserted into the center comes out with moist crumbs. Allow the brownies to cool completely.
Melt the Belgian white chocolate in a microwave in 30-second intervals, stirring in between until smooth. Divide into separate bowls and mix each with a pastel candy color.
Drizzle the colored chocolate over the cooled brownies in a decorative pattern.
Immediately sprinkle Easter sprinkles and crushed mini eggs over the drizzled chocolate so they adhere.
Allow the drizzle to set before slicing into 16 equal squares.
Place Kit Kat chocolate bunnies on top of the brownies if desired