To make, mix cake powder, egg, milk, and oil in a bowl. If mixture ends up super thick, slowly add more milk in until it is a little softer.

Line a brownie pan with parchment paper, and spray with nonstick.

Pour half of mix in the pan, spreading evenly out into the corners.

Sprinkle with a full layer of white chocolate chips.

Top with rest of cake mix, add on sprinkles, and bake at 350 degrees for around 25 minutes.

When fully cooked, take out to cool, remove parchment paper from pan, and cut into squares.