Brown Butter Blondies Gelson's

Ingredients

• 1 stick unsalted butter, plus more for greasing the pan
• 1 cup light or dark brown sugar
• 1 large Gelson’s egg
• 1 tsp vanilla extract
• ½ tsp kosher salt
• 1 cup all-purpose flour
• 1 ½ cups mix-ins*
• * We used 1 cup chocolate chunks and ½ cup toasted walnut pieces.