One Bowl Blondies

Ingredients (11)

• 1 cup unsalted butter,
• 2 cups packed dark brown sugar
• 2 eggs,
• 1 tablespoon vanilla extract
• 2 cups all-purpose flour
• 3/4 teaspoon baking powder
• 1/2 teaspoon baking soda
• 1/2 teaspoon salt
• 1 cup chocolate chips
• 1 cup toffee pieces
• Flaked sea salt,