Monster Brownies

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For the Brownies:

Cooking spray

1 3/4 cups all-purpose flour

1/4 cup unsweetened cocoa powder

1 teaspoon baking powder

1 teaspoon salt

6 ounces unsweetened chocolate, chopped

2 sticks unsalted butter

1 1/4 cups granulated sugar

1 1/4 cups light brown sugar

1 1/4 cups water

4 large eggs

2 teaspoons pure vanilla extract

For the Frosting:

1 1/2 sticks (12 tablespoons) unsalted butter, at room temperature

3 cups confectioners' sugar

3/4 cup unsweetened cocoa powder

1/4 cup milk, plus more as needed

1 teaspoon pure vanilla extract

1/4 teaspoon kosher salt

Candy eyeballs and green and purple sprinkles, for decorating