Preheat your oven to 350 degrees F and line a 9x9 metal pan with parchment paper. Set it aside.

In a large mixing bowl, sift together the flour, cocoa powder, cornstarch and salt.

In another bowl, whisk together the melted butter and granulated and brown sugar. Add your eggs, vanilla extract, and corn syrup. Whisk until it is all combined.

Stir in the dry ingredients just until combined and there are no clumps that remain.

Pour the ingredients into your prepared pan and bake for 20 minutes or until a toothpick comes out mostly clean. Allow your brownies to completely cool.

While your brownies cool, make your ganache. If you have a double boiler you can use that or a pot with a glass bowl on top of the pot, melt your chocolate chips whisking constantly to make sure they do not burn. Slowly pour the cream, whisking constantly until smooth and combined. Pour it over the brownies and allow it to sit for at least 20 minutes then you can add sprinkles. Refrigerate for 1-2 hours before cutting.