Fudgy Oreo Brownies

1 and 1/2 cups (300g) granulated sugar

3/4 cup (75g) cocoa powder

1/4 teaspoon salt

2 large eggs, cold

2 teaspoons vanilla extract

1/2 cup (60g) plain/all-purpose flour

1/2 cup (90g) chocolate chips

16 Oreos, whole

Oreos, chopped