Step 1

Preheat oven to 375°F. Line a 10×15 jelly roll pan with aluminum foil and coat lightly with nonstick spray. Set aside.

Step 2

In large mixing bowl, whisk together flour, soda and salt. Set aside.

Step 3

In a saucepan combine butter, cocoa, both sugars, and water. Bring to boil and then immediately remove from the heat.

Step 4

In small bowl combine buttermilk, eggs and vanilla; whisk lightly with a fork. Slowly add this to the warm chocolate mixture, stirring constantly.

Step 5

Pour this into the dry ingredients, and mix until smooth.

Step 6

Pour batter into the prepared pan and bake for 20 minutes or until the center is set.

Step 7

When there is about 5 minutes left for the brownies to bake make your frosting.

Step 8

In a saucepan, butter, cocoa powder and buttermilk. Cook on medium heat until just boiling and remove from heat.

Step 9

Whisk in the powdered sugar and vanilla.

Step 10

Immediately pour/spread the frosting over warm brownies.

Step 11

Sprinkle with sprinkles immediately.

Step 12

Serve warm or room temperature.