Preheat your oven to 350°F (175°C). Line the baking pan with parchment paper and spray with cooking spray.

In a medium mixing bowl, whisk together flour, baking powder, corn starch, and salt.

In a large mixing bowl, beat melted butter with granulated sugar and brown sugar until light and fluffy.

Add in the egg and egg yolk, mixing well after each addition. Then stir in the vanilla extract.

Gradually add the dry mixture to your wet ingredients, folding them together until just combined.

Gently fold in the chopped Golden Oreos and sprinkles until evenly distributed.

Pour the batter into the prepared pan and smooth the top. Press remaining Oreos and extra sprinkles on top.

Bake for 25-30 minutes, or until the edges are golden and a toothpick comes out with a few moist crumbs.

Allow the blondies to cool completely before cutting into squares.