Step 1

Preheat oven to 350 degrees F.

Step 2

In a large mixing bowl, cream together softened butter and brown sugar.

Step 3

Mix in eggs and vanilla.

Step 4

Add baking powder, salt and flour and mix until well combined.

Step 5

Fold in white chocolate chips and sprinkles, reserving some of them to sprinkle on top before baking.

Step 6

Spray a half baking sheet (18 x 13 inch) with nonstick cooking spray, spread dough out evenly and top with remaining sprinkles.

Step 7

Bake for 20-25 minutes, or until middle is set and edges are golden brown.

Step 8

Let cool and cut into squares.