Peanut Butter Chocolate Chunk Bars

Ingredients

• 1/2 cup smooth peanut butter
• 2 eggs plus one egg yolk
• 1 teaspoon vanilla extract
• 1 teaspoon baking powder
• 1 stick unsalted butter
• 2 1/4 cups all purpose flour
• 6 ounces semi-sweet chocolate chunks
• 1/4 teaspoon baking soda
• 1 3/4 cups light brown sugar
• 1/2 teaspoon salt