Gooey and Chewy Toffee Brownies

Unsalted butter

Granulated sugar

Kosher salt

Vanilla extract

All-purpose flour, spooned in measuring cup then leveled

Salt

Unsweetened cocoa powder

Semi-sweet chocolate chips

Unsalted butter, cut into pieces

Granulated sugar

Light brown sugar, tightly packed

Large eggs, room temperature

Vanilla bean paste

Homemade toffee

Semi-sweet chocolate chips